Must one partner's business profits, generated through an agreement that 1% of them would revert to the company, be distributed after the partners demand it, contrary to the previous agreement?

You are obligated to fulfill the condition and adhere to what you have agreed upon, for the Prophet, peace and blessings be upon him, said: "Muslims are bound by their conditions." As long as you have agreed with your partners that whoever works alone outside the three specializations keeps their profit entirely, and that they can use the company's invoices in exchange for contributing 1% of their profits to the company, then you are only required to pay this percentage.