Search files in MacOSX Finder


Hi there,
I am using Cryptomator to manage save passwords in a dropbox folder.
The last versions, I was able to use the Finder’s search field on the right top edge of the opened Cryptomator folder. This doesn’t work anymore. As I have a lot of files stored in this folder, I am looking for a possibility for a fulltext search on filenames. Is there a solution?