Main window size is less of problem for me, its things like your Preview window size trick that I don't like being reinstated.
My 2 pane File Manager has a very simple approach to the issue. In its main preference settings there's a Save program state on exit check box, if that's set then next time you start it it'll be in whatever state it was in when last exited - I have that unset.
There's also a Save settings now menu option, on first use it overwrites the default settings. After configuring its layout etc I used that option. The net result is that it always starts in the saved state - no matter what shambles it was in when I last exited.
BR
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