Increase Windows taskbar thumbnail/preview size
Solution 1:
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Launch Regedit.exe and navigate to the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband Create a DWORD value named MinThumbSizePx.
Double-click MinThumbSizePx and set its value data accordingly. I set it to 350 (Decimal).
Kill the Explorer task in the task manager and restart Explorer.