What version of Sigil? 7.x on windows does not have that problem.
Marking is the standard keyboard way for multiple file selection. (Drag selection does not function)
Select the first
Then hold the shiftkey and select the last
or
hold the control key and click each
then
Ctrl-M for Merge
Huge sections and device performance suffers, even if it does not choke.
Many older devices have a ~200K limit before they choke.
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