'Custom' pen set is not good to use as it is just a temporary state as you are amending the pens.
You need to 'Store As' to and overwrite an existing pen set or create a new one.
Then you use that pen set.
The same goes for layers (and anything else that says 'Custom').
If you manually turn a layer on/off, the layer combination will say custom.
Your views will all be set with a particular pen set or layer combination.
So as soon as you activate the view, the 'Custom' pens or layers will be lost.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10