How open layer's attribute table as tab?
Before reinstall OS on QGIS 3.8 I opened layer's attribute table as tab, after on QGIS 3.10 I can't find this option.
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Settings -> Options Data Sources Tab
This functionality was merged into QGIS as of PR 35933, and is in release 3.14
The other answer is correct for changing the general behavior. If you want to change for a single session, you can use the button in the attribute table:
If you have many dock with the attribute table, you can make tabs by drag and drop one widget on top of the other one, it will give you tabs like this: