How to activate/deactivate menu tab and keep the same id?

If it’s all about CSS & you don’t mind adding/removing it manually, please consider using a CSS class for that particular menu item. If you don’t see the option, click screen options in top-right, then check the option for CSS classes. Then you can write all the CSS on this class instead of the ID.

For all other options, you’ll go in your theme & use a custom walker for your menu. If the id remains constant, you can add or ignore the particular item from being displayed depending on some condition.
It is also possible to add a checkbox(let’s say) to every menu item, then check that value in your custom walker & deactivate the menu item accordingly.

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