Actually, the ability to choose presence depends on the degree of presence that's emerging in you. Ultimately, you are not choosing, there's nobody there to choose. When you think you are choosing, presence is simply emerging in that moment.
Eckhart TollePresence remains even amidst worldly activities. Stillness is there even when you're doing something quickly, like rushing to answer the phone. Otherwise you would be condemned to moving in slow motion.
Eckhart TolleTo experience anything fully and see it clearly there must be a moment of presence where conceptual thinking is not interfering with your experience of that moment.
Eckhart TolleSurrender becomes so much easier when you realize the fleeting nature of all experiences and that the world cannot give you anything of lasting value. You then continue to meet people, to be involved in experience and activities, but without the wants and fears of the egoic self. That is to say, you no longer demand that a situation, person, place, or event should satisfy you or make you happy. It's passing and imperfect nature is allowed to be.
Eckhart Tolle