In fact, Related tab provides access to the related entities.
To hide/remove items from Related Tab on the form then follow the below steps:
Settings > Customizations > Customize the system.
Expand Entities > Current entity(Lead) >Forms, open the current form.
Click 'Navigation', select one item you don't need , then click 'Remove'
Drag one from right pane to left pane, then it can be displayed under Related tab.
Save and Publish.
I hope you can mark my answer verified if it answer your question! If you have any questions, please feel free to contact me. Regards, Leah
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