FX inserts on mixer channels

Hi Guys - Have I a problem here or am I missing the point? :confused:

When I activate the insert rack in the new mixer and try and add an insert effect, all I get is a drop down saying ‘no effects’.
However, If I add the FX insert on the channel in the arranger window, it appears in the mixer. Whilst this is a “work around” it’s no expected behavior IMHO. Also, I am unable to add any master effects on the send out channel [such as a mastering plugin ETC].

The manual clearly states, activate the insert ‘rack’ and click on drop down arrow to insert the effect. Have I missed something here on how to insert FX into the mixer?