I think esc will close the box, it may need some repair though.
I mostly use WYSIWYG editor for outline editing, press - or * will create list, and press tab will indent, shift tab un-indent, so it is an outline editor. I don’t use much other features recently.
oh, you mean how I get 10000 tiddlers, I use Calendar and Agenda plugin tw-calendar with Mobile friendly agenda page layout for quick diary, so each day will have 10 tiddlers, and I use GitHub - tiddly-gittly/Browser-Extension-Tiddlywiki-Collector: Clip web contents into TiddlyWiki (NodeJS Ver./TidGi APP) and use TiddlyWiki as a bookmark. to save websites, it also increase a lot.