At the following link you can find an example template to help speakers accommodate the closed captioning on their slides.
https://drive.google.com/drive/folders/17FlG7ozgQe4Nvs0r0_CT465iE43cyvfd?usp=sharing
The caption box can be moved anywhere on the slide, and the location can be moved from talk to talk.
A slide is also included in this template where you can see the potential effect of not accommodating the captions.