not sure if this was ever possible, but seems like such a ubiquitous feature that seems to be missing from mendix.
also using ctrl+shift to select multple components doesnt work
(usually used when copy pasting sections around)
do you know i the planned version is for items in the left bar only (project explorer) or for in the main modeler view too?
Same as this idear: https://forum.mendix.com/link/ideas/449
and this idear: https://forum.mendix.com/link/ideas/24
And the last one is on the planned list.