Not likely Windows 11. If there's only a single video track, the thumbs will be considerably larger. But the above expansion tactics should provide a decent size. And you certainly can reinstall. Slight feature variations can appear, and in some installs this feature may be one of them...
Untitled.mp4 Share the project and we'll see what it looks like here. It's easy, takes but a few minutes and can be private. Just follow these four steps...
Back up --- With your project on the timeline, click on MENU at the top-left. Click FILE|BACK UP PROJECT FILES TO FOLDER. Choose a folder and SELECT FOLDER.
Upload --- Use a free server - Google Drive, MS OneDrive, etc.* - to upload the saved, numbered FOLDER. Do NOT upload the individual VPJ or export file.
Get link --- Get a public link. If using Google Drive click GET SHAREABLE LINK. If necessary change "restricted" to "anyone with the link can view"
Share --- Click COPY LINK | DONE. Paste that link here, or click the folder at the top-right of this forum to message it privately to me. It won't be shared.
* Before uploading, right-click the folder, click PROPERTIES. Look at the File Size to confirm that it's not too big for the free space on the server.