My problem is solved. I used to open my drawing in the project map instead of the view map.
Then this means the settings of your views in the view map will need updating/changing.
Go into the view settings and make sure you have the correct pen set, Model View Options , renovation filter, etc., set so you see what you want.
The view map views are what you will want to use in your layouts because they remeber all these settings and will stay constant.
The views in the project map hve all these settings manually set by you and they will not alter as you select another view in the project map unless you actually change them yourself.
This can be handy while you are working on a project but when you start to place views (drawings) on layouts then you will want them to remember thier individual settings.
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