Not able to find "ripple" button for shifting slides to right when changing length of a single slide

[Mark S]

I have the trial version of PTE AV Studio Pro.  I have slides loaded into timeline.  When I lengthen (or shorten) duration of a slide, the adjacent slide length is offset by same amount of time.  I've gone round and round with ChatGPT and Gemini who were telling me similar ways to find the "ripple" control (toggle) but it's not there.  Does anyone know how to set the program such that when I change the length of a single or several slides that it does not affect the length of the remaining slides (e.g. if I shift the duration of a slide by 5 seconds, all the slides to the right should stay the same duration resulting in the total slide show increasing in time by 5 seconds.  Thank you.