Need finer width options

Bear 2.0 defines the width setting in typography to be in units of 8 em.
I would like to set the width more precisely.

I would like to have the editor line widths aligned when printing a file created in Bear or exporting as a PDF.
That cannot be achieved in 8em increments.

In the Bear 1.x version, the width could be aligned.
I would like to see the adjustment method modified so that the new Bear can also align with the output.