Mode Change is a common feature in the Metal Saga. It involves a Beyblade changing its Performance Tip, Metal Wheel positioning, Energy Ring rotation and many other methods.
Mode Changing was first seen with Hikaru's Storm Aquario's HF/S tip, in which you could twist the tip to change between a Hole Flat and a Sharp tip. This was further developed with Lightning L-Drago 100HF since you could rotate the Energy Ring to switch between Counter and Barrage Modes. It was later on seen with Storm Capricorn M145Q with M145 and Q.
Mode Changing was developed even further with the introduction of the Beyblade: Metal Fury season. This season brought in the new 4D system, which used multiple frames in Fusion Wheels and Performance Tips that change mid-battle.
The first in the season to do such a thing was Big Bang Pegasis F:D. Its 4D Track Final Drive allows for switching between a Rubber Hole Flat and a Semi Flat during battle. This was quickly followed up by multiple other tracks, such as Final Survive, Delta Drive and Bearing Drive.
Furthermore, Fusion Wheels could now change moves by adjusting the positioning of the frames. Big Bang Pegasis has four different modes which are all different combinations of part locations. Nearly all beys in the 4D Generation follow this trait. In the Anime, some beys can change their modes, whereas others, like Death Quetzalcoatl 125RDF cannot.
In real life, only Final Drive, Final Survive, and X Drive can change modes during battle, much to the disappointment of fans.