Hi Sumaira,
This is because Editable Grid has been added to the controls of these entities.
To make Read Only Grid the only control, please follow these steps.
Open the customizations panel, click an entity (such as Lead), click its Controls tab.
You should see the Editable Grid, click on its delete button.

Then only Read-only Grid. Save.

Do the same for other entities. Finally publish all customizations.