I had a requirement to remove the assign button on the case, I know that by default the assign button is hidden when assign role is remove from the case entity,. but due to Complex Security Teams and BU, I couldnt Achieve it, so the Quick Solution was to create the display rule and add the entity privelege rule besides it and it worked for me.
The other part is simple to customise the command button and add the display rules against them
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