latest update appears to have broken features
In your recent update these features no longer seem to properly work:
PDF Thumbnail previews in Windows Explorer : this use to show the first page in a PDF as a JPG image. It no longer does.
Text in dialog boxes becomes small when document is open. Can no longer change the size of the fonts in these dialog boxes. They change to very small font sizes when a document is opened, difficult to read
With our latest release on 25th Feb. 2021, the issue reported by you has been addressed.
If your product has not already been updated, to get the latest product update, click on the menu Help --> Check for updates in the product.
For more information about the release, please refer to the Release Notes (https://helpx.adobe.com/acrobat/release-note/release-notes-acrobat-reader.html).
Hope this helps in addressing the reported issue. We look forward to the continued feedback.(Edited by admin)