Provide an option to turn off the thumbnail half in the Open File dialogue

This is a major annoyance (slowdown = annoying) for me:

The File Open dialogue consists of the “file” half (directory tree, list of files, and below that, filename and extension selection) and the thumbnail half.

The thumbnail is shown, forcibly, every time a file comes under the cursor. That means it is displayed even for MSCX files, for which it has to be (slowly) generated first.

Even if I double-click the file (which will immediately close the dialogue after the ten-second-or-so pause to generate the thumbnail, so I’m never seeing the just-generated, unwanted, thumbnail anyway).

Also, this makes the file half of the dialogue very small. Small enough most of my very descriptive, easier-to-recognise-than-some-thumbnails, filenames are not displayed in full (on my 1024x768 laptop display).

So, please provide an option to disable the thumbail half (enabling the file part to take up more space, and disabling on-the-fly thumbnail creation for non-MSCZ files). This option must persist in the configuration. There are two common places where this could be done:

① An additional button in the top part of the dialogue (where the back, up, etc. buttons are placed) is common, I believe especially in the Windows world?

② A regular MuseScore UI preference in the normal preferences dialogue would work

Either will help (do not implement both).