The Properties side pane only offers a part of the wealth of formatting options available in the various dialogs. To be concise, the options are presented as “shortcuts” to most frequent values under the form of drop-down menus (in which you obviously enumerate only a few values).
In the dialogs where a dimension can be freely entered, measurement are presented initially in the default units for your locale or as set in
General, Unit of measurement.
But this setting does not preclude the use of another unit. You noticed that the unit is part of the text box. If you enter a number without unit, the default unit is used. If you explicitly specify a unit as pt, in, cm, mm, …, it overrides the default unit.
In you case, if you see
0.1 cm, replace it with
1 pt and you’re done.
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