I am currently using

window.location.assign('/umbraco');

Which works but the entire page/backoffice kinda loads & flashes all the UI again. Wondered if there was a nicer way to navigate around without the flash/load ?!

OK history.pushstate was the answer for me. Again is it the right way?! No idea...

ts
// Navigate to the root of /umbraco/section/content
history.pushState(null, '', '/umbraco/section/content');