There are a couple of steps you need to accomplish, in order to allow "redlining" collaboration for tracking changes in Contractbook drafts:
1. Share the draft with the relevant legal team (or any other external collaborator) who needs the "redlining" option for changes enabled.
The document needs to be in draft status when being shared. This way, any suggestions for changes can be directly taken into consideration during the contract's creation process.
If the contract is already sent for signature, therefore in a Pending state, you need to first make a copy of the contract (Duplicate), and this way revert it back to a completely identical draft.
Note: Remember that after duplicating the contract, you will now have two versions of the same
document but in different states: one will remain Pending and the new one will be a Draft. You can find them in your documents' overview and make sure to delete the pending one directly from the relevant tab.
2. The recipients of the draft will then be able to add comments to the body of the draft and submit them for your final approval, before initiating the signature process.
You can find more details about adding public comments in drafts here.