After the most recent updates with H2d styled interface that brought many UI changes to both the Bambu Studio and Printer interfaces, the cold pull functionality has been altered to make it impossible to do as stated in the Bambu Wiki.
The cold pull procedure is instructed to be performed at 100 degrees C, but the newest firmware will not allow for extruder retraction at lower than 170 degrees.
have you tried letting it cool down to 0, then when you click to lets say 170 …pull and spamclick on the reverse to pull it out as soon as it reaches 100?