I have the same issue, but none of the solutions I could find online resolved the issue, although I have managed to stumble on a workaround.

Background: I have a Company managed Intune Windows11 laptop, which means I do not have Administrator rights over the Win11 OS. I have therefore downloaded the R-Studio zip file, rather than the proper Windows Installer, so as to avoid having to enter Administrator credentials which I do not have.

I have several RMD code files which call function file.choose() to select a CSV file to read in my data. I get a File Selection Window where I cannot see any file details, similar to the above thread. I therefore have to guess the correct file to load or put only 1 file in the input directory.

Workaround:  After starting R-Studio, I type “file.choose()” in the Console window in the bottom left corner of the screen. This launches the File Selection Window correctly and I am able to see all of the file details. If I now run my RMD code, all file operations display correctly. Note; I have to repeat this process each time R-Studio restarts. It is not a permanent fix.