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~~No, you can't. FreeCAD always uses metric and you can change it to display non-metric units on a global level.~~
See also this [discussion](https://forum.freecad.org/viewtopic.php?style=1&t=34834).
~~But honestly, using non-metric units is a stupid idea anyway, don't do that. Use metric for everything. There shouldn't be anything non-metric.~~
If you really want non-metric units on some documents but not all, you may can use 2 different configuration files, one where you set FreeCAD to use SI units and one where you set FreeCAD to use British units and then use a script or something like that that opens FreeCAD with the arguments `--user-cfg /path/to/config/file/si.cfg` or `--user-cfg /path/to/config/file/nonmetric.cfg`. Alternatively, you could create a script that edits the configuration files. Maybe something like this:
sed 's/.*UserSchema.*/ <FCInt Name=\"UserSchema\" Value=\"1\"\/>/' -i "$HOME/.FreeCAD/user.cfg"
To automatically change the units FreeCAD displays.
This is of course a workaround. It would be of course better to fix the root cause (the use of non-metric units).

There's not a simple way.
One way to do it is to use 2 different configuration files, one where you set FreeCAD to use SI units and one where you set FreeCAD to use British units and then use a script or something like that that opens FreeCAD with the arguments `--user-cfg /path/to/config/file/si.cfg` or `--user-cfg /path/to/config/file/nonmetric.cfg`. Alternatively, you could create a script that edits the configuration files. Maybe something like this:
sed 's/.*UserSchema.*/ <FCInt Name=\"UserSchema\" Value=\"1\"\/>/' -i "$HOME/.FreeCAD/user.cfg"
To automatically change the units FreeCAD displays.
See also the FreeCAD [discussion](https://forum.freecad.org/viewtopic.php?style=1&t=34834) about this topic.

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