HFSS How to clear field.* files from project's folder?

In my projoject's folders are saved lot of files with names fields.evtrs and other extentions.

Projects folder take 100Mb and more.

How to clear saved filds.* files, becose they no more needed,
& to save only structure without results?

Thanks

I just need to delete folder name_of_project.hfssresults

Thanks for attention