How can ı do this ?
If the holes are planar,
run the cap command, then run mergeallcoplanarfaces
then check for naked edges with showedges
I’m not trying to cover the holes, I just want the open areas to look like this.
I must be confused… are you trying to model this part with the holes as shown. or do you already have a part that you need to modify?
Open areas appear in cyan. How can I do this? I just want the appearance to be like this.
nope, there is a surface back there, you can see it here-
that is 100% a backface color.