Need help with a behavior action

I have a table view that has two columns with an app formula to pull in data from another table, these are [Recent Row].[Check in Time] and check out time…

In the table view I have an action button for rapid check in and only want the button visible when the person is in checked out status. I initially had the behavior condition set for ISBLANK([Checked In]) and this worked - for the first check in/out time only.

Once someone checks in and then out the button stays hidden instead of showing again for a new check in.

I’m struggling with figuring out the right condition expression. Can someone help?

Please post a screenshot of the action configuration.