hi @Mohammad! section editor demo site, Section Editor — create, edit, fold, manage sections seems to be in an unusual state
i tried with firefox and safari on latest macos
shiraz, Shiraz 2.8.3 — create stylish contents in Tiddlywiki for example seems to be working fine
i just tweaked my copy of section editor to default to all sections foldstate closed and wanted to compare to the latest version’s original code. the plugin upgrade seemed to work fine, and my tweaked copy seems to work ok after purging foldstate tiddlers. the reason i am doing this is that i have “long” section tiddlers, which are better folded up for ease of jumping to a relevant section on mobile, and upgrading TW by default removes the foldstate tiddlers anyway. hope all’s well and thanks again for section editor!