Sounds like you've undocked the Slides pane.
Help article is here:
https://help.libreoffice.org/6.4/en-US/text/shared/guide/autohide.html
From: anne-ology
Sent: Saturday, July 11, 2020 10:37 AM
To: users@global.libreoffice.org
Subject: [libreoffice-users] disappearing slider in impress
Having no problems until once again that slider on the left side decided
to disappear;
then somehow it re-appeared, but now is only 1/2 the length size,
rather than extending the length of the space on the left side,
it's 1/2 the size & is in a floating (?) rather than stable
position.
Please explain what causes this to disappear; & please explain how to
get it back - & now how to get it back to its original size & into its
permanent, rather than floating spot.
Thanks in advance,
& keep up the good work,
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