With the mass function „Recall all units“, you have the ability to recall all units that are stationed in foreign habitats.

First you have to decide which units you want to recall. You can select any unit type as long as there is at least 1 unit stationed in a foreign habitat.

Here you can see the units home habitats and the amount of units for each selected unit type that are stationed in one or more foreign habitats. Choose a home habitat by clicking on the cell. 

If you press „Recall all units“, all your units of the selected type stationed in a foreign habitat will be recalled to your selected home habitat.