It is not possible to remove the action column on related lists in page layouts declaratively, the number of actions available will depend on the user's Profile and its permissions on the child object, a profile with read only access will be the only one that displays no actions in the column.
So, as an option you can go with VisualForce pages replacing the standard page layouts.
Handling these in VF page will look like below,sharing as an example:
I don't think we can remove Edit/Del actions. Kindly review below Idea link and vote for this feature.
https://trailblazer.salesforce.com/ideaView?id=08730000000BrqR
Please mark as Best Answer if above information was helpful so that it can help others in the future.
Thanks,
It is not possible to remove the action column on related lists in page layouts declaratively, the number of actions available will depend on the user's Profile and its permissions on the child object, a profile with read only access will be the only one that displays no actions in the column.
So, as an option you can go with VisualForce pages replacing the standard page layouts.
Handling these in VF page will look like below,sharing as an example: Hope above information helps, Please mark as Best Answer so that it can help others in the future.
Thanks.