right click them in the taskbar and unpin to remove them.
then click start, in the Cortana search field, type your program of choice, right click it in the results list, Send To, Desktop

you could go to the Lock Screen manually by pressing Windows Key + L.
useful in organisations when you have to walk away from your PC and don't want prying eyes or can't wait for the auto timer to...

So if no-one has any ideas, can someone at least confirm the problem is across all Win10 PC's?

Right click on the Taskbar, go to Toolbars, New Toolbar, make one, drag one of your programs into it...

Has anyone else noticed that when you click a link in a toolbar that it updates the Date Modified field.
While not important in itself, the side-effect is it makes the toolbar link get included with...