How to increase the thumbnail size in import files dialogue?

Thanks for reaching out again, Rustam_Himadiiev. From here, so we can see if this is happening in other places, let us know if this happens in safe mode: Start up your Mac in safe mode

Regards.

Don't you have a slider in the bottom right hand corner of the Finder window?

If not give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

Hi Rustam_Himadiiev,

We'd recommend the steps below, which can help with changing the size of thumbnails and icons:

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Make icons and other items bigger on your Mac

• Increase the size of icons and text on the desktop: Control-click the desktop, choose Show View Options, then move the “Icon size” slider to the right. Click the “Text size” pop-up menu, then choose a text size.
• Increase the size of icons and text in the Finder: Select an item in the Finder, then choose View > Show View Options. The view you’re using determines how you increase the size.
  • Icon view: Move the “Icon size” slider to the right. Click the “Text size” pop-up menu, then choose a text size.
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Make it easier to see what’s on the screen of your Mac

Cheers.