Need help in viewing only own data in Quote History, Tsk Activity and sales History

Hello @arshkhurana

you probably don’t need to / can’t use the Studio for that.

One option is to use filters - with 8.6 the quick filters are really efficient:

(but that’s just for the list view - not the subpanels)

Or, if you need to have some permission system setup, the go to option would be roles:

If these approaches won’t work for you, customizing might be the only way forward.
There are a few threads here in the forums on ā€œsubpanel filterā€: