I also am a little frustrated with this. It would be great if there was just a way to manually refresh things like scroll to the top of the page and ‘pull down’ like you do with most other apps.
What is particularly annoying is that I can click onto one of my investments and see my profits etc, but then when I back out of the individual investment onto the dashboard the numbers there are outdated and incorrect. It then takes a while for it to update and show the correct numbers within my overall portfolio.
The only workaround I can find at the moment is just to hard close the app and reload it.