in IE 11 how can I display F12 tools on the side instead of the bottom?

As David said there's no way to do this, even for Edge currently, but there is a workaround...

Press F12 to bring up dev tools in Edge.

Click on the dock button above once you open dev tools (icon next to 'X')

This undocks the dev tools then press: CTRL+SHIFT+WINDOWS BUTTON + RIGHT ARROW to move the undocked dev tools to the right of the screen and you can use your mouse to adjust the width of the dev tools relative to your main window. Hopefully one day it'll be out of the box as it is in Chrome and Firefox ;-).

No, there is no way of doing this. It is a known feature request however.