How would I go about removing databases from showing up in the File > Open > Hosts list. I have too many databases in there and I would like to just make a master database that my users can just open and from there they can access all the other databases. I simply want to hide specific databases from that list. Thanks.

Why not avoid the File>Open>host completely. Create an opener file Which has buttons that are scripted to open the databases. If you put the same password on the opener file as the main files. The users will only be prompted for a password 1 time(when they open the Opener file). Much easier then opening them through the File>open>hosts.

Set the file's sharing to Multi-user Hidden.

can this setting be applied remotely, through remote administration, or do I have to close the files on filemaker server, bring them into filemaker pro, reset the sharing to multi-user (hidden), then reopen them on filemaker server?

close the files on filemaker server, bring them into filemaker pro, reset the sharing to multi-user (hidden), then reopen them on filemaker server

One method is to add an underscore to the end of the file name like this:

filename_.fp5

This will keep it from comming up.