Change frame of text field

I have been using WebFlow for three weeks and am not very experienced yet. I would like frame 1 (Brix - Slider Mask Testimonial V3 3) to be the same size as frame 2 (Brix - Card Content Testimonial V3 3) in the mobile view (see image). Frame two currently adapts to the text. Frame one is fixed, unless frame two has more text and is therefore larger than frame one. Then they are the same size. They are also different slides, so they influence each other again.

What options are there to ensure that the two frames are the same size on all slides?

I would appreciate your help!