Select the drawing on the layout.
Right mouse click and then 'Open Source View'.
If it is there you will see it.
If it is not in that view then it is separate on the layout or in the master layout as suggested.
Barry.
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