Godot version:
v3.2.3.stable.official
OS/device including version:
macOS Catalina 10.15.7
Issue description:
Image assets containing text menu in the official tutorial, when imported to Godot, they look like this:

I believe neat, elegant UI will makes you guys more efficiency.
Minimal reproduction project:
MainMenuDesign.zip
I can confirm this on 3.2.4beta1 on Linux:

The issue isn't specific to hiDPI displays.
Is this referring to the aspect ratio or the filtering (or both)? (I'm guessing aspect ratio?)
@lawnjelly Probably the aspect ratio.
I looked into this a bit and found that the small preview thumbnails are always generated with the same height and width:
https://github.com/godotengine/godot/blob/be14d9d6448a9017c982fd7e30631525aed8f339/editor/editor_resource_preview.cpp#L176-L182
On my system small_thumbnail_size is 16. If i scale the preview thumbnails in a way that they preserve their aspect ratio it looks like this (sadly not really an improvement):
I'm not sure what can be done about this except making the tumbnails bigger, which also sucks.
It does look marginally better to my eyes with correct aspect ratio, but there is less info conveyed.
What I have done in previous apps with this problem, is use a tooltip. When you hover over the item, it shows a larger thumbnail. This might take a bit of rejigging to achieve, but is an option.
Most helpful comment
It does look marginally better to my eyes with correct aspect ratio, but there is less info conveyed.
What I have done in previous apps with this problem, is use a tooltip. When you hover over the item, it shows a larger thumbnail. This might take a bit of rejigging to achieve, but is an option.