Rent payments that have been offset and not paid out to the landlord can be unwound from the original transaction. This will move the funds to the unassigned lines, allowing any remaining funds to be reassigned.
Go to Properties > Property Balances and into either the landlord or tenant ledger for the property in question.
On the top right of the page, click on Bank lines.
Against any of the Offset rent bank lines, under Transaction Type, it will show the ID of the bank line that was originally offset.
Click on the ID number of the original line
In the new screen, click Remove offset rent lines
This process will only unwind the portion of the original transaction that has not yet been paid out to the landlord. Any funds not yet paid out to the landlord will now appear in Financials > Unassigned lines to be reallocated as required.