The screenshot that OP provided would appear to show the "Advanced Preview"... AFTER the "finalize" button has been selected... PRIOR to "finalize" being clicked the RBF checkbox and locktime boxes are still available for editing:
AFTER "finalize" is clicked, then the RBF and locktime values are set like the OPs screenshot:
Unfortunately i can't sign or broadcast. these options are greyed out. also there is no transaction ID , and i am sending them to a wallet address.
The only instance I can find where the "sign" and "broadcast" buttons are greyed out is when you have a "watching only" wallet...
@OP, if you see "watching only" in the title bar of your wallet like this:
Then, unfortunately, you do not have the private keys in this wallet to be able to spend the coins...