Solved How to change the size of a minimized MDI window

I'm facing an issue with in-app minimized windows, which are broken on my Windows 11 (certainly by a software, but I don't know which one...). Those in-app minimized windows are much more narrower that it should be. Instead of having the minimized title bar containing title and 3 buttons, I can only see the close button. I read here it wasn't possible to change this size for a unique software, but I assume it's possible to change it for the whole system? Here is a capture of the issue in ultraedit and here in 3dsMax for example.

Troubleshooting software conflicts can be a tedious thing but performing a clean boot can direct you to a troublesome app. Perform a Clean Boot in Windows 11 to Troubleshoot Software Conflicts Tutorial

glasskuter said:

Troubleshooting software conflicts can be a tedious thing but performing a clean boot can direct you to a troublesome app. Perform a Clean Boot in Windows 11 to Troubleshoot Software Conflicts Tutorial

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Hi Glasskuter,

Thank you for your answer.
Already tried your guidance before but with no result.
This certainly happened with a software installed on my pc but I can't determinate which one.

Some additional clues:

- On a fresh new windows account just created, minimized mdi windows are OK. When I reboot, the issue appear and does not go away. (my guess is a registry value is changed at reboot)

- This is happening with all softwares using MDI.

- Had this issue on a former windows 10 environment (I reinstalled a fresh W11 system and put back all my previous software at same time, so impossible to know which one modified this setting)

I'm focused on searching THE windows parameter that I can change to go back to normal, rather than finding the software incriminated, for now.

To those who have the same problem as me, I found the solution:

(win+r) regedit
HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics
add the string value "MinWidth".

Change the string value named "MinWidth". Set its value using the following formula:
-15*width in pixels

For me, acceptable one was -3300

Little drawback: It also changes size of the minimized windows in the taskbar (make them much wider when there is a few of them in taskbar)