If the post is not already published, to skip publishing to Typeshare, simply deselect the Typeshare destination when choosing your destinations in the publish modal.

To hide an existing published posts, press the press the 3 dots beside in the post header (or if you are on the post page, press the 3 dots in the top right corner) then select the "Hide From Profile" option.

Note: this makes the post so that only you are able to view it on Typeshare.