How to dock attribute table in QGIS such that both tables can be docked horizontally and viewed at the same time?
This option exists in QGIS 3.14 - Open attribute tables as tabs. You can open many attribute tables and they will be organized in tabs. Then, you can click on each tab to view the contents of each attribute table.
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Did you use any keyboard shortcuts to open the attribute table for both layers? – Taras Oct 16 '20 at 5:20
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