Why can't Drag files using Mojave

2012 mini mac running Mojave update can not drag files any were. when you click on the file and hold it just enlarges.

Thanks for helping.

Have a Mac book pro 2012 with mojave update it seems to work fine.

Thank you very much work great. Always something new in update and a new track pad. Very nice Thank you again.

Would of never figure that one.