Mandatory field inside the Convert Lead function

Hi,
I would like to change one field (Move Activities) in the Convert Lead to mandatory
Img here → https://drive.google.com/file/d/11Nx-7vKMpOgXyeT4dMCQvVf3dywlFdrZ/view?usp=sharing

Any ideas please?

Are you a developer?

Have you looked at the files in this directory…

modules\Leads\tpls

I am not Developer, but I will let him know. Thank you.