1000 times this.
Please put the altitude slider back on the front as a first-class control. Or at least a config setting to put it there for those who need it. Found this forum and registered just to post this.
To review weather at different altitudes used to just require a swipe. Now it's TAP open, wait, SWIPE, TAP close....and repeat for each altitude you might want to review!
The best visual weather tool ever made has just been really spoiled by introducing this UI friction.
Personally I found the previous UI to be faultless, if occasionally a little slow on my ageing phone.
Apart from this issue, congratulations on creating the most wonderful weather app. Thank you so much. With the introduction of radar recently, Windy is now my single go-to app for reviewing regular and aviation weather.
PS: the latest iphone upgrade blew away my app settings, which was a minor pain. If possible, please preserve them between upgrades.