Hi @dan1123 ,
I suggest that you use TESA tape to seal the case. (click on the Store icon at the top of the page to find the ifixit store closest to you and then click on Parts and search for TESA tape -click on the size to find the various sizes available) )
Here’s the ifixit Fairphone 3 Display Module Replacement guide. This shows how to remove the display so that the old seal can be cleaned away using Isopropyl Alcohol 99%+ (available at electronics parts stores) and the appropriately sized tape fitted all around the case edge and the display sealed back again.
Maybe the best option for the long term and will prevent any adhesive that you may try to use, from leaking into the phone making it more difficult if you ever need to repair it.
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