For me too many UI elements personally. It would be enough to have some option to resize the VFB to the size of a specific history item (which has the size mismatch).
Usually RMB and LMB are reserved for A/B selection. But in case of a item with size mismatch, there could be "Resize to this item" or similar. Or a double click could trigger it; text in preview would then be "Size Mismatch [size], double click to fit" - I don't mind.
Any option would be welcome because yes, it's cumbersome to twiddle with it to get the correct size of old items because for some reason VFB size changed during work.
So a +0.5 from me :)
Good Luck