Almost all games in the auto-battler genre, like Teamfight Tactics and League of Legends, don't allow players to remove items from units. Nevertheless, situations may arise where you've equipped the wrong items or have better items or units elsewhere, prompting the need to transfer items. In Teamfight Tactics, there are methods to reclaim equipped items.
Tips for Playing Teamfight Tactics.
How to Remove Equipment from Champions in Teamfight Tactics
Step 1: Identify the champion you want to unequip, then hold three items for that champion; it's mandatory to hold three items to remove gear.
Step 2: When you have two 2-star units and two 1-star units, and you've equipped three items on a 2-star unit, place the unit with equipment on the bench and place the unequipped 2-star unit in the Elemental Tile on the board. Then, purchase the last 1-star unit to upgrade it to 3 stars, and the three items from the other unit will drop, allowing you to equip other champions.
There's another method to remove the Thief's Gloves from a champion. If you have a Training Gauntlet on a champion, place that unit in the Elemental Tile, then combine the remaining Training Gauntlet into it, and the Thief's Gloves will automatically drop.
Here are two simple methods for removing items from champions without selling them. Currently, top Teamfight Tactics players are utilizing the Frozen Nation Rampage comp to climb ranks rapidly. You can check it out for reference.