Pages in the Master Pages folder do not get published. Therefore, you can move the page there temporarily until you are ready to publish.
Do the following in the left side Site pane in the Freeway window: Drag the page from Site Folder up to Master pages. Give it a name when prompted and delete the copy that still exists in the Site Folder. When ready to publish the page, move it back to the Site Folder.
Master pages is also a great place to keep bits and pieces of items you might want to experiment with, keep and reuse but don’t want prying eyes to see.
I should’ve added a word of caution - make sure when adding the page back to the Site Folder you copy and paste the items from the Master page into the page. If you change or delete the Master associated with the page you will loose the content. Someone will probably suggest a better way to do this.