Illustrator 30.0 saving thumbnails and projects with white artboard wider than artboard of project

[Dimp88]

After upgrading to Illustrator 30.0 my projects and their thumbnails are saved from Illustrator 30.0 with a white artboard on their rightside about one inch wider than the artboard used in making the project. The attached screeshot shows the opening page of  illustrator 30.0 and the thumbnail of a project with a white artboard sticking out on it's rightside wider than artboard that the project was created on in illustrator 30.0. This white extened artboard also appears when the project is saved in formats other than illustrator.  This was not happening in the previous version of Illustrator. Is there a fix or a work around for this annoying issue.

[Ton Frederiks]

Can you show the Artboards panel?

Is it possible to select that artboard there?