please consider fine tuning for the size thumbnails :
consider CTRL + mouse wheel (like windows 10 thumbnail mode)
(and switch it with the ALT + mouse wheel for the size of the text, because if it's like windows the move/transition will be more smooth)
or left click on empty space slide left/right or up/down change height/width of the size of thumbnails in the thumbnails view...
because it's suck so much to go on configuration panel every time you want adjust the size of thumbnails....
and please, why not 5 level or 7 level of size for the thumbnails , something like :
highest size
higher size
high size
normal size
low size
lower size
lowest size
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