UX - Screen bottom left.... stops showing Data after some 200 columns

My CollectUser sheet contains many of the variables that might be needed in the app later (as I can usually access ‘User’ data) — and I have strings for every text label to support a multilingual app.

This means I have at least 300 columns in that sheet - and it keeps growing.

I love the Data visualizer in the UX designer - but it turns out if you keep scrolling and have ‘too many columns’, the extra rows just do not appear.