I want to edit Activities and History subpanels in suitecrm . How do i achieve this?

Hello Experts
I want to edit the Activities and History sub-panels in suitecrm how do i achieve this can anyone help me on this.
Thank you in advance.

You have to create a custom version of subpaneldefs.php of the corresponding module.

Example for Leads module:

To create a custom version read this.