The default measurement range of the accelerometer is +/-2g in all 3 axes. However, the micro:bit accelerometer hardware (MMA8653FC) has configurable ranges, and can stretch as far as 8g.
Choose set accelorometer range from the Input blocks and cange the value to 8g
Micropython allows you to read 3g, 6g and 8g gestures
The underlying runtime code (the DAL) written in C++ by Lancaster Uni, allows this to be chosen at runtime by calling setrange
Keywords for search: 8g, range of the accelerometer, measure, maximum