I installed the ‘normal’ v1.5.0 SDK and tried using the SEGGER IDE.
Following the instructions in the Toolchain Manager “first steps to build” info I was able to get sample projects loaded in.
The trick is to use the File | Open nRF Connect SDK Project… option and then ensure you set the checkboxes in the import dialog properly so you can see the options you want in the dropdowns. The feather won’t show up by default unless you check the appropriate box. I couldn’t get the nfed projects to show in the dropdowns but could navigate to them and import them with the … button.
I’ve just done this with the nfed gps project and built it ok.