I also ran into the same issue as @HD3. There is no option for me to Restore or "See more options for version management" from clicking "App version history" in the Power Apps.
1. Clicking "App version history"

2. Version history page doesn't allow any actions at all. There are no ellipses to access the version control functionality.

After struggling for hours, I finally found a way to restore previous versions of the Customize Form. Here is what I found:
1. In your SharePoint List, go to "Integrate" > "Power Apps" > "Customize forms" to open the custom form in Power Apps
2. Click "Share" (I know sharing has nothing to do with version control, but it will take you where you can access and restore previous versions)

3. After clicking "Share", you will land on this page. You can disregard the Share dialogue box and click on "Versions" tab in the background.

4. You now can access all the versions recorded with the option to restore and publish whichever version you like.

Hope this help whoever is in need!