Scott. If I understand you correctly, you are wanting to remove individually listed character sheets from your
journal tab. To do that you have to be the GM or be assigned to the sheet (in the edit&control). If you are then you need to open the character sheet (clicking on it) then click on the edit button (top right corner of the sheet) and scroll down towards the bottom of the sheet editor to click on delete button.


Be very sure you wish to remove this sheet as once deleted it is gone permanently.
At this time, there is no method to remove multiple sheets in bulk.