Users may encounter Quick Action visibility issues on Case or Work Order record pages, even if the buttons are added to the page layout and the Activity component is on the record page. These objects don't behave like other objects and Quick Actions can be on a tab in the Chatter panel.
Quick actions' visibility can be managed on the page layout by adding it to Salesforce Mobile and Lightning Experience Actions. This won't work for Case & Work Order page layouts in Lightning Experience all the time.
Quick Actions may not appear on Case and Work Order page layouts in Lightning Experience due to Feed Tracking settings or component configuration. The resolution depends on your org setup — follow the applicable scenario below.
This information is also documented in the Help Article Actions in Lightning Experience:
Feed Tracking is enabled for a Case or Work Order
These two options will allow for the Quick Action to be viewed on a Case or Work Order when not available as expected and Feed Tracking is enabled:
Option A: Add the Chatter Component to the Page Layout
Quick Actions will appear on the Chatter tab.Option B: Disable Feed Tracking.
Salesforce Idea: Proposal to move Quick Actions in Case to highlights panel instead of Chatter tab
Support Video: Step-by-step troubleshooting walkthrough for Quick Action visibility issues
Trailblazer Community - Quick action not showing on page layout
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