There are a few different ways to eliminate the horizontal scrollbar in Odoo:
Make sure that the width of all elements within the view is not wider than the width of the view. This will ensure that there is no need for a horizontal scrollbar.
If you are using a form view, you can set the layout attribute to 'default' to disable the horizontal scrollbar. For example:
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If you are using a tree view, you can set the overflow attribute to 'hidden' to disable the horizontal scrollbar. For example:
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If you are using a kanban view, you can set the scroll attribute to 'false' to disable the horizontal scrollbar. For example:
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I hope this helps! Let me know if you have any questions