Ctrl+D performs the find_under_expand
command in sublime. This basically searched for the next occurrence of the already selected text and sel
Currently its mapped with
for selection, Alt + J
for unselection, Alt + Shift + J
but if you're familiar with sublime shortcuts like Ctrl + D
Jetbrains give you an option to change settings,
Settings -> Keymap -> Editor Actions
search for multiple selection, find Alt + J then right click -> select change keyboard shortcuts
set shortcuts you want as like sublime, Ctrl + D
Here is the Docs