Type "bookmark" as the filter and select "Add Bookmark"
Click in the box related to binding at the bottom.
Erase previously assigned hotkeys with delete or backspace
Then hit Ctrl + Shift + A
Similarly select "Go to next bookmark" and assign Ctrl + B to
it.
Finally, select "Toggle Bookmark" at the bottom, and assign Ctrl +
Shift + B to it.
This way you can:
hit Ctrl + Shift + A to add a bookmark with name (which is shown if
you open the Bookmarks view with the name you entered and you can double click on it to go to that line).
hit Ctrl + Shift + B to add a bookmark without name (which is also shown in the Bookmarks view but named as "Quick bookmark").
hit Ctrl + B to switch between bookmarks and is very handy if you have a few number of bookmarks.