Sims will only choose to autonomously put a toddler out of the highchair if the toddler already has the hidden 'left behind in highchair' buff. This should make it easier for your toddler to finish their meal before they are taken out by the next fool.
Please note that high chair interactions are also heavily triggered by the check on toddler interactions. So for best results, you should absolutely consider to install my <strong>lessautonomouscheckontoddler</strong> mod in addition to this one.
All my Sims were getting the Uncomfortable Buff so i tweaked it a bit. The Small Buff is changed from +1 Uncomfortable to Fine with a Duration of 30 Minutes instead of 120. The Middle Buff is changed from +2 Uncomfortable to +1 Uncomfortable with a Duration of 60 Minutes instead of 120. The High Buff is changed from +3 Uncomfortable to +2 Uncomfortable