[Savage Worlds] Help modifying encumbrance

This question is about the Savage Worlds tabbed character sheet. I would like to be able to make the encumbrance penalty apply to different skills. I see there is a column on the skills tab for encumbrance, with all Agility and Str skills automatically selected.  How can I choose which skills to select? The check boxes are all grayed out for me and I can't select/deselect them.  Thanks for any help!

You can't select/un-select them (the sheet was written to follow the core-rules, so I didn't make them editable, and they are only visible to keep the aesthetic of the sheet consistent for items where you can select/un-select it). I can add this to the wishlist and I'll see what I can do and changing that, though.

Thank you for the reply. Also, I must say the sheet is great. :)  I just started using it and really appreciate the work put into it. 

Thanks. :)