avalaible slot after break if break duration does not match with grid display

My problem is the following: I schedule 1h30 duration meetings, and I have set up a one hour break. The point is that my slots are divided by 1H30 plots for the whole day, rather than starting at new after my break end time. An example to make it clearer 9h30/11h 11h/12h30 break 12H30/13H30 next slot should be 13h30/15h and NOT 14h/15h30 Can you check this for me please? Thank you for your help. Regards