Make Tabs work in Headers (and Footers) and correct Default docx Template
Default template must be exported from Word in order to create proper header tab marks and it is still very difficult to insert page number and move header text around to correct places with "tab" key as expected.
Default should have a left tab 'holder' at left margin, a right tab 'holder' at right margin and a center tab 'holder' in the center. This should work with both metric and imperial rulers and margin size changes.
(Last tested in 8.3 Desktop Editors)

Closed as invalid due to no response.
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AdminConstantine (Admin, ONLYOFFICE) commented
Please update your app to the latest version 9.0 and check out the situation again.
With latest release double-clicking a header/footer opens it up, Tab key works similarly to MS Word processor – pressing Tab key from default position (left) moves cursor to center and second Tab brings it to the right margin.
If I misunderstand the scenario, please elaborate.