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I’m pleased to hear that that worked well for you, i.e. reducing max iterations down to 2 or 3 for large networks.
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I believe this is related to your previous post here: Query re handling svg files in Inkscape - #6 by jmaewyn. If the colors are still set as hex colors rathern than rgba( ) colors then selection will not work as expected since it uses alpha transparency to make the unselected nodes semi-transparent. My suggestion would be to revert the colors to rgba( ) and only use hex colors for SVG export.
Somewhat separately, Edge should work find but I generally suggest using Chrome for the explore view where possible.