It is a common misconception that after the pour you can remove the bracing. This is false and the falsework is still fully loaded until the jacks are wound down. The load from the concrete is not transferred to the columns and walls of the permanent structure until the falsework is removed. If you were to remove the bracing in the falsework, it would buckle and reassemble Figure 3 above.
Please note that this advice and the comments herein are general in nature. If ever in doubt, please seek advice from an engineer.