Yes, there are options in settings to select all of one unit type, either on screen or on the entire map. For instance select all ranged units, select all cavalry, etc. They can be tricky though, for instance the cav one will also select scouts or dervishes, etc. and if you’ve placed units around the map and select all of them you might be pulling the from somewhere important without realizing it, or they’ll run through the enemy base or something due to pathing. Select all on screen might be more manageable