Maybe you made some changes to your preferences and want to rebuild the weekly meal plan accordingly. Or maybe you just really hated the meal plan. You can easily regenerate the entire plan at once.
From your Planner page, select the Regenerate icon for the week you want to rebuild.

This will open up options to the right to customize the regeneration options.

Reset Groceries
Assuming you want your grocery list to be updated according the plan changes, leave the Reset Groceries option checked.
What is your focus?
Select whether the generator should prioritize more variety in the plans, adhering to your macro targets as closely as possible, using more of the same foods to reduce needed groceries, or an equal balance of everything.
Keep existing meals?
Select Keep if you cleared out some meals but want to keep what's still in the plan, or select Replace if you want to regenerate every meal in the plan.
Select Generate to apply your selections, and your week will be regenerated accordingly.