Yes. In general you want to open wider with a bigger stack. Here's an example of a relatively similar spot. CEV 60bb and PKO 90% field left BTN 110bb, SB 50bb, BB 70bb.

https://gyazo.com/f2716785b0084e4a8125084a9975d91b

https://gyazo.com/79c577d80cdabff3a3a792e4292a4424

Same thing happens for flatting/3B.
Range expansion, relative to cEV, is wider as lower stacks are getting smaller.

Hi, what is the timestamp for the hand you're referring to?

when you say in multiway pot we may bet small, otherwise should we bet big in HU pot?

-when you say in multiway pot we may bet small, otherwise should we bet big in HU pot?

In multiway pots we use smaller size more freq relative to HU pots. It's not always the case, as there are still some boards/spots where you should bet big, but it's less often the case then in HU pots. However HU pots also have a lot of small bets as well (but from what I've seen less then in 3way pots)

No, this is for PKO's.

this part I don't undestand. "is wider as lower stacks are getting smaller."

If were in CO with 50bb and BB has 2bb, we would expand our range quite a bit in PKOs.
So what I mean by "as lower stacks are getting smaller."- is closer the stacks behind us are to 0 our range would expand more and more (if we cover those stacks).

A4s- def close vs 15bb, you could argue folding is better
QJo- sometimes,but far less then vs mr
AQo- not really a high EV spot, folding is def fine/good- if you expect villain to be a bit too aggro, you want to continue more and AQ can do more calling/3b in that case (As also nice as it unblocks his Ax bdfd)
88- I don't have a clear answer for this as it depends on all 3 players. If CO has no traps, and BB is playing in such a way where he's reshoving strong hands and calls weaker (meaning he's likely to fold range) we can shove range, while on the flip side if CO is going to have decent amount of traps, and BB is only calling strong hands our range will be relatively tight. I would suggest playing around in ICMIZER or HRC with different ranges too see how eq change and figure out a rough range for X spot that way. Obv in game we're unlikely to know exactly how someone is playing or what their range is, but you can find thresholds for certain hands and get much closer to the correct answer later on in game that way. Hopefully this helps :)