Yes, you can see your balance in all the different currencies you have with PayPal. There is also the “Estimated total” which shows the estimated total of your total PayPal balance in GBP. The “Estimated total” is based on the most recent conversion rate and includes PayPal’s currency conversion fee.
If you hold funds in many different currencies, you may need to scroll down to see them all. You can view all of this under “Estimated total”.