I personally teach children to imbibe the habit of allowing the host dissolve in the mouth than chew. Even though there is no directive from the Church concerning this.
You can decide to either chew or let dissolve. In the past, people always chewed because then the host was more bread-like and wouldn’t dissolve that easily unless chewed. There are people whose consciences are uneasy about chewing, this isn’t something to worry about. But if you cannot get over this uneasiness, then let it dissolve.