it’s not only me in the forum, others can answer this too.
I don’t know why, but for a few days now, the “task and memos” bar
has no longer been displayed in the Calendar view.
You did not mention the Evolution version, I guess it’s 3.56.1 or
simply the 3.56.x series (see below).
It can happen the column is so small that it’s almost invisible, but
your screenshot suggests it’s not the case. I have the tasks & memos
panel visible here, but I cannot hide it - clicking the menu option
simply does not flip it. This is with the current development version,
to be 3.57.1 in some weeks.
As a workaround, you can change the state from the command line, even
when Evolution is running, with:
gsettings set org.gnome.evolution.calendar show-tag-vpane true
I would usually ask for a bug report at
but as the 3.56.2 should be released tomorrow (no promises, maybe it’ll
be next week), then I fixed it for that version without a bug
reference.