Since it has been so long, here's a comparison of events relative to 2018.
Aquatics
Diving Removed: All events; 3m springboard (M/F), 10m platform (M/F), Team (Mix)
Swimming Removed: 800m freestyle (M/F), 4x100m freestyle relay (M/F/Mix), and 4x100m medley relay (M/F/Mix)
Badminton
Removed: Team (Mix)
Baseball/Softball
Add: Baseball5 (Mix)
Basketball
Removed: Dunk contest (M), Shoot-out contest (F)
Boxing
Add: 1 women's category
Removed: 4 men's categories
Canoeing
Slalom Removed: All events; Obstacle C1 (M/F), Obstacle K1 (M/F)
Sprint Removed: All events; Head-to-head C1 (M/F), Head-to-head K1 (M/F)
Cycling
Add: Road race (M/F), Time trial (M/F)
Removed: Combined team (M/F), BMX Race (Mix), BMX Freestyle (Mix)
Dancesport (Breaking)
Removed: Team (Mix)
Equestrian
Removed: Team (Mix)
Fencing
Removed: Team (Mix)
Field Hockey
Removed: All events; Hockey5s (M/F)
Golf
Removed: All events; Individual (M/F), Team (Mix)
Gymnastics
Add: Team Artistic All-Around (Mix)
Acrobatics Removed: All events; Pairs (Mix)
Artistic Removed: Floor (M/F), Vault (M/F), Rings (M), Pommel horse (M), Horizontal bar (M), Parallel bar (M), Uneven bars (F), Balance beam (F)
Rhythmic Removed: All events; Individual all-around (F)
Trampoline Removed: All events; Individual (M/F)
Combined Removed: All events; Team (Mix)
Judo
Removed: Team (Mix)
Karate
Removed: All events; M (-61kg, -68kg, +68kg), F (-53kg, -59kg, +59kg)
Modern pentathlon
Removed: All events; Individual (M/F), Team (Mix)
Roller sports
Skateboarding Add: Street (M/F)
Speed skating Removed: All events; Combined (M/F)
Rowing
Add: Costal single sculls (M/F), Costal double sculls (Mix)
Removed: Single sculls (M/F), Coxless pairs (M/F)
Sailing
Removed: Kiteboarding (M/F), Multihull Class (Mix)
Shooting
Removed: All events; Air Rifle (M/F/Mix Team), Air Pistol (M/F/Mix Team)
Sport climbing
Removed: All events; Combined (M/F)
Taekwondo
Add: Team (Mix)
Tennis
Removed: All events; Singles (M/F), Doubles (M/F/Mix)
Triathlon
Removed: Relay (Mix)
Weightlifting
Removed: All events; M (-56kg, -62kg, -69kg, -77kg, 85kg, +85kg), W (-44kg, -48kg, -53kg, -58kg, -63kg, +63kg)
Wrestling
Beach Wrestling Add: M (-50kg, -60kg, -70kg, -80kg), W (-40kg, -50kg, -60kg, -70kg)
Freestyle Remove: M (-48kg, -55kg, -65kg, -80kg, -110kg), W (-43kg, -49kg, -57kg, -65kg, -73kg)
Greco-Roman Removed: M (-45kg, -51kg, -60kg, -71kg, -92kg)
Wushu
Add: Changquan Combined (M/F), Taijiquan Combined (M/F)
In total we have dropped from 239 to 151 events. Olympic sports Canoeing, Field Hockey, Golf, Modern Pentathlon, Shooting, Sport Climbing, Tennis, and Weightlifting will not be involved in any matter while the non-Olympic sport of Karate was also dropped. Baseball/Softball, Dancesport, and Wushu are non-Olympic sports which will get to participate in some capacity.
22/31 Olympic sports will be present (surfing has yet to be involved at a Youth Olympics).
I know we can't (or should) emulate the Olympic program, but hosts should try to include as many sports as possible, especially the relatively cheaper ones like shooting, sport climbing and weightlifting. The good thing is that it looks like the mixed NOCs events are gone (I think they mentioned this earlier).