How do I quickly pull up my biometrics when I travel internationally

Hello, I am getting ready to travel out of the country. I have completed my indefinite leave to remain. I have an American Passport but have not gone for my British citizenship yet. I have the UK immigration app on my phone, but it doesn't seem straightforward to pull lt up when I need to show why I am traveling back to the UK, and it's my permanent address. Is there an area to show straightforward instructions for me to present it at the immigration site when crossing a border?  Thank you!

You shouldn't need to show anything on the app at UK immigration, as your e-visa is linked to your passport and will be automatically checked when you go through immigration.

It is a good idea to get a share code from the UKVI app before you travel though (the share code is valid for 90 days), just in case they ask for it.

See here: https://www.gov.uk/evisa/travel-with-evisa

From that link:

Before you travel to or from the UK

Make sure that:
- your eVisa shows the correct details - you can view your eVisa to check
- your UKVI account has your most recent passport and personal details - you can update your UKVI account
- you get a share code - your carrier or a border official may ask for it
- your details exactly match the passenger information you give to your carrier
If you cannot view your eVisa, check that you have finished setting up your UKVI account.

When you travel
You must travel with a passport or travel document that you’ve added to your UKVI account.

Your eVisa will be checked automatically when you show your passport or other travel document to your carrier or pass through border control.

You might also be asked to provide additional proof of your immigration status, for example:
- a share code
 - a physical immigration document - if you have one