Hi Prathvi,
Depends what you mean by "convenient," but your two choices are:

(1) open the 2D Labels dialog again
<https://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/2dlabels/2dlabels.html>
 - OR -
(2) open Preferences (from Favorites menu), and in that dialog go to Category: Mouse, then assign some button to the move-2D-labels function.  The icon looks like a vertical "ABC".  There are also icons for the mouse modes that move the regular "3D" labels, or 2D arrows, or color key.  However, if you want to use that mouse button for its normal function again, you have to change it back manually in this Mouse preferences dialog.  (So it might still be easier just to reopen the 2D Labels tool instead.)
<https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/preferences.html#Mouse>

In ChimeraX it is different and maybe more convenient: the mousemode icons are on a toolbar across the top for easy switching.

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco


> On Jan 4, 2022, at 6:00 AM, Prathvi Singh via Chimera-users <chimera-users@cgl.ucsf.edu> wrote:
>
> Hi Elaine,
>
> Is there a convenient way (a keyboard or mouse shortcut) to move 2D labels around once the 2D labels window has been closed?
>
> Thanks
>
> --
> Prathvi Singh,
> Research Fellow,
> Department of Biological Sciences & Bioengineering,
> Indian Institute of Technology, Kanpur-208016
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