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- Open Terminal
- Type below commands:

Code:
cd ~
find . -name ".DS_Store" -delete

This will delete all .DS_Store files that manages your individual window settings. Then, execute:

Code:
rm Library/Preferences/com.apple.finder.plist

This will reset your Finder preferences.

I can't speak regarding the resize problems, but when I upgraded from Mojave to Catalina, my Finder window positions and sizes were messed up, and toolbars were appearing out of nowhere; this fixed it. Deleting prefs and .DS_Store files usually fixes these kinds of quirks.
Did not seem not make any difference… Too bad!
 
I am sorry to hear that. Please make sure to report the issue to Apple through Feedback Assistant.
 
Versions previous to Big Sur retained open/save dialog sizes on an app-by-app basis. Absolutely vital, and badly missed in the current version. Re Funkypepper's solution, above: will it clear the dialog size for the finder and all apps, or just the finder? Is there any command that can fix this problem across the board?

Hello, Apple? Fix this one, please.
 
Versions previous to Big Sur retained open/save dialog sizes on an app-by-app basis. Absolutely vital, and badly missed in the current version. Re Funkypepper's solution, above: will it clear the dialog size for the finder and all apps, or just the finder? Is there any command that can fix this problem across the board?

Hello, Apple? Fix this one, please.
Is the open/save dialog a part of Finder? I guess so. But its size attributes are probably stored elsewhere if deleting Finder's did not work. Some insight on this might be useful.
 
DS_Store files store Finder window and icon info... it has nothing to do with Open/Save dialog boxes.
Finder Prefs won't fix this problem either, because the problem isn't in the Finder, it's in the window services portion of the OS.

If deleting DS_Store or resetting Finder prefs worked for you to fix the window resize bug, it's purely coincidental.
 
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- Open Terminal
- Type below commands:

Code:
cd ~
find . -name ".DS_Store" -delete

This will delete all .DS_Store files that manages your individual window settings. Then, execute:

Code:
rm Library/Preferences/com.apple.finder.plist

This will reset your Finder preferences.

I can't speak regarding the resize problems, but when I upgraded from Mojave to Catalina, my Finder window positions and sizes were messed up, and toolbars were appearing out of nowhere; this fixed it. Deleting prefs and .DS_Store files usually fixes these kinds of quirks.
I executed these commands to clean up some of my previous preferences and settings but noticed that Terminal requires full access to a variety of things. Should I disable Terminal access after these commands are run in Security/Privacy settings or safe to leave them as is?
 
I executed these commands to clean up some of my previous preferences and settings but noticed that Terminal requires full access to a variety of things. Should I disable Terminal access after these commands are run in Security/Privacy settings or safe to leave them as is?
Up to you. Terminal is an internal application anyway, so the security of your system theoretically depends on the commands you enter. Those privileges are meant for the command-line applications, like the ones you just entered (cd, rm etc.). If you do not install malicious command-line applications, you are fine.
 
Apple does not live here. 😉😁
File feedback to Apple here:
The more people that report a problem, the more likely Apple is to fix it in a timely manner.
Thanks, I’ve gone ahead and submitted bug feedback on this.
 
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Mine is even worse than this, and only displays 3 items to your 5 in the window, and cuts off more in my sidebar. For some reason Photoshop is fine though, but Indesign and Illustrator windows are both broken. So frustrating.
For me Photoshop is the worst, crushed so small that it's not even showing a single file.
 
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The size used is saved in the following preference keys:
NSNavPanelExpandedSizeForOpenMode
NSNavPanelExpandedSizeForSaveMode

You can set the system global default with the following terminal commands (put whatever values you want):

defaults write -g NSNavPanelExpandedSizeForOpenMode -string '{900, 600}'
defaults write -g NSNavPanelExpandedSizeForSaveMode -string '{900, 600}'


They will be inherited the first time you open or save in an app. If that doesn't fix it, you'll have to also remove the already stored setting per app. I don't have InDesign installed, but for illustrator for example, it would be:

defaults delete com.adobe.illustrator.plist NSNavPanelExpandedSizeForOpenMode
defaults delete com.adobe.illustrator.plist NSNavPanelExpandedSizeForSaveMode


Find the name for the InDesign plist in ~/Library/Preferences and plug it into the command in place of com.adobe.illustrator.plist.

I've always had my global default set to 900x600 with the first commands above, and am not seeing this issue in any adobe apps that I do have installed.
 
The size used is saved in the following preference keys:
NSNavPanelExpandedSizeForOpenMode
NSNavPanelExpandedSizeForSaveMode

You can set the system global default with the following terminal commands (put whatever values you want):

defaults write -g NSNavPanelExpandedSizeForOpenMode -string '{900, 600}'
defaults write -g NSNavPanelExpandedSizeForSaveMode -string '{900, 600}'


They will be inherited the first time you open or save in an app. If that doesn't fix it, you'll have to also remove the already stored setting per app. I don't have InDesign installed, but for illustrator for example, it would be:

defaults delete com.adobe.illustrator.plist NSNavPanelExpandedSizeForOpenMode
defaults delete com.adobe.illustrator.plist NSNavPanelExpandedSizeForSaveMode


Find the name for the InDesign plist in ~/Library/Preferences and plug it into the command in place of com.adobe.illustrator.plist.

I've always had my global default set to 900x600 with the first commands above, and am not seeing this issue in any adobe apps that I do have installed.
this didn't change anything on my end. Same issue arises and I can't even move the open/save dialogue window to another location on the screen. If I expand it by using the corner of the window and dragging out, eventually the window extends beyond my current display where I can't see a part of the open/save dialogue window.

I also couldn't find any specific .plist files for my relevant applications, even did a global search and couldn't find any.
 
Ok so here’s something weird. Set up a new M1 Mac yesterday (11.1), and it IS displaying this issue. Also it’s not limited to Adobe apps. Every app defaults to open/save dialogs at the smallest size and does not remember changes.

My old intel Mac (11.0.1 upgraded from Catalina) is not having this problem.

EDIT: OK, so I just updated thee old Mac to 11.1, and now it as this problem too, so 11.1 does seem to be the culprit.
 
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I'm not on the beta train (😁) right now. You could ask over here:
 
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I'm not on the beta train (😁) right now. You could ask over here:
Thanks for the info!
 
THIS IS HORRIBLE....It is slowing me down SO MUCH. Have to pull at the dialog box from TWO directions each time. Seriously affecting my work flow and production time. FIX THIS APPLE!!! (OS 11.1)
 
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