PPT Presenter View preview slide not keeping up

Hi all,

I'm trying to use Powerpoint to project supertitles (captions) live for an opera on a Macbook. Been a while since I've used the software and the current version of presenter mode is giving us some issues. We've got the current slide in the top left, the next slide in the top right and that's all great. Then we have the preview of the current slide at the bottom and every time we go to the next slide it's doing this sliding motion to the next slide even thought the slide show itself has no transitions. The slides at the top work the same as the slide show so we can work with it but it's a kind of really distracting having the slides at the bottom get way behind and glitch out because we're flying through some of these slides.

Does anyone know a way to hide the bottom preview or disable the timing on it so it just snaps to the next slide like the actual slide show does? All timings of everything are disabled and set to manual or zero. I just can't find any option regarding that section of the Presenter View. TIA.