The state, pos ans sizes of the different floating windows are stored in a file named "Poser UI Prefs_0000x0000xml"
Instead of 0's, they indicate the screen width and height. in my case: 1920x1080

The file is stored here: "%appdata%\Poser Pro\11", copy-paste the formula without the quote in the launch windows (Windows Key + R):

Each floating Windows informations are stored by room. Example:

If you are patient enough, using a simple text editor such as Notepad or better NotePad++, open the file and look for the string FlexLibraryPalette its position is referenced by floatx=... and floaty=...

Once you have corrected, you may keep a backup of the file, + LibraryPrefs.xml and LibraryState.xml. As usual, make a copy before modifying it

Another tool that's very handy is this one:

It's used room by room and it saved my time numerous times, especially with my setup (Poser is organized on two to three screens on my PC)

𝒫𝒽𝓎𝓁

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(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sonoma 14.6.1, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️