For text-based blocks like paragraphs and headings, you can use the alignment toolbar that appears above the block. Options include left, center, and right alignment.
For image blocks, you can also align images left, center, right, or make them full-width or wide-width.
If the built-in alignment options don’t provide the control you need, you can use custom CSS to achieve the desired layout. Hope this helps.
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Enable WP_DEBUG and when loading WordPress Editor / Elementor check for the errors and post them here. that away, we will be able to follow up from there.