I believe you would like to set the distance in the Z axis - however, this is impossible.
If you are having difficulties with removing both support structures and raft from the model - this could suggest the print is overheated, or the lower fan is not working. When was the last time you replaced any consumable parts (such as the hotend and heater&thermocouple)? Also, I would recommend running autocalibration prior to the next print.
maintenance work should be regular in order to keep the printer in good condition and achieve high quality prints every time, hence it is highly recommended to have consumable parts at hand and replace them regularly - you will find the guides on the Support Center.
The models look as if there were overheated - it might be high time you replaced the hotend and heater&thermocouple (350/400 printing hours). Also, run the fan test to ensure the extruder fan coolers are operational.
why there is no z gap setting?
Our printer is pretty useless after upadate tu Z-Suite.
Support material always meltet into model no way from getting it off.
Surface also looks worse than before.
Don´t know it´s because Software or Firmware.
Played with settings but without fixing the problem of support material.