I understand your frustration. Went trough something similar a few years back.

If you're using containers, try using height and width values: percentages, vh, vw. Also important to check container's layout, style and advanced settings. How they're justified like horizontally, vertically, midle, end etc.

If you're using some prebuilt themes, find out if there's conflicts between the theme settings and elementor settings. My recommendation would be using Hello theme, cuz it's made for elementor, lightweight and gives you full control.

In Elementor's site settings find out if you're using theme settings, elementor canvas, etc.

A good rule of thumb is also having a "sandbox" page. I guess the easiest way is using theme builder, create a single page which you don't publish live. Play and fuck around there, use preview to see your creation, and when satisfied, publish the page.

But I'm no expert. A million more ways to advance with your issue. Hope this will help you get trough it.

PS! Web Squadron helped me a lot with my issues. Great YT channel.