It doesn’t display accurately in the stats menu for me - it’s telling me I only have a 4q EB when I had a 28q EB before the update. This stats calculator worked pretty well for me, though https://repl.it/repls/MindlessGroundedFirewall
Prestige when the soul egg increase is going too slow for your preferences and you're not currently working on a long mission/trophy.
additional advice:
For more details read Patashu's egg inc guide.
If you aren't working on a long mission/trophy and the white bar is going up too slowly for your personal happiness, prestige.
A) Finish all missions first.
2) When missions are complete trophies are unlocked.
D) when you get a chance look up "patashu's egg inc guide". It has a lot of information and it should answer most of your questions.
BONUS: Soul eggs are based on prestige earnings (click the menu button [3x3 grid of dots] -> stats -> near the bottom is prestige earnings). I made a graph that shows how many soul eggs you can expect based on prestige earnings and epic research (z-slider).
https://www.desmos.com/calculator/rnez48m3z8 Click the spanner in the upper right to adjust the axis to fit your values.
They're built to be multi-player collaborative projects.
I'd recommend downloading a chat app "Discord" from your app store/play store. There's a community on Discord (a server) specifically for this game, access the first time by clicking this link. (After the first time, just open the Discord app and look for the cartoon chicken.) Once you're into Discord and you see all the topic labels on the left (chat rooms/channels), you're going to be spending most of your time in #general, #tips-and-tricks, #contract-discussion, and (Standard) #contract-recruitment.
There's a LOT of information, so very first step for getting started within Discord is to get help on finding the About information and the Pinned Posts for each chat room/channel. The core community is very helpful, but there's an expectation that users start by asking questions in the right place. You won't get in trouble or anything, just proactive advice for smoothest results.