Wing Woo Gar
Senior Master
I’m only recently converted from 1st Ed to 5 th Ed having disdainfully dismissed all versions between with barely a notice. I have a lot to learn in 5 e.Dropping a weapon is a free action. Drawing/picking up a weapon is an object interaction.
That isn't how two weapon fighting works in 5e...
Your character gets X attacks per round (determined by the books). Using a second weapon changes that to X+1 attacks, with the single extra attack being with the off-hand. That off-hand attack doesn't get your usual bonuses unless you have the Two weapon fighting style or feat. And both of your weapons need to have the LIGHT property, so forget about using two longswords.
It's not a very good implementation, in my opinion. I think it was done for balance, but it just makes two weapon fighting untenable.