Hi everyone!

I'm using Autocad LT 2020 for Mac and I'm having some issues with xrefs:

I'm working on drawing A where I have drawing B as an xref.

Drawing B has another xref which I will call C. 

When I'm working on drawing A, I only need to see drawing B so I unload drawing C, but every time I update drawing B, drawing C get's reloaded. This also happens every time I reopen drawing A. 

How can I keep drawing C unloaded in drawing A?