As per instructions, UX page for stock exception review, time period are monthly , half yearly and yearly.
Where my time drop down shows the weeks too. Is it not managed well till now?
You're good. That's just how the context selectors work in Anaplan. If the module you're using is by week then the context selector will show weeks. Only way to change that is to create a module that's by month or half, add the grid, then sync the selector and hide the weekly one. Not pretty but it works.