thumbnails interfere with reading the board title. default should be no thumbnail or a basic one. Each time i create a new board, miro gives it a different thumbnail. Reading my list of boards and finding the right one is confusing.
Look at how notion.io does it. You create a new page and the default is a plain page icon - no color, no illustration.
Thus the titles of the board stand out instead of this stupid icon.
see 1min loom i made. sorry for frustration. i like miro its just they do some things from a UI perspective that drives me absolutely nuts.