You can convert it to a morph and then it should show, but it will be harder to edit in future.
TIP: if you do that, keep a copy of what you used in the SEO in a hidden layer or off to the side so you can change it if needed later and convert to a morph again.
Or you have to add fills and lines in the plan so it looks as you want - that is what most will do.
One of the forum moderators. Versions 6.5 to 27 Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10 Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11