You can’t delete the Decel point, however you may be able to move it depending on the STAR. If you’re flying an RNAV star with a VIA that goes directly into the approach you’re SOL. However if you’re flying a STAR terminates with a track or hdg (a DISCON between the star and approach) you’re in luck. Create a Place/Bearing/Distance point prior to the first fix of the programmed approach.
Example: Flying the TARPN RNAV into FLL it ends in a discon prior to the ILS 28R. Create a PBD of FUZYY/096/10 (10-20nm) and place it below FUZYY. That will create a discon between the PBD and FUZZY, delete the discon and you’ll see the Decel point move to your final. This also will fix the ALT constraints that may appear from the Decel point (and the start of the Decel segment.)