Selenium cannot find the required element, what to fix?

Question

selenium

I'm new to selenium, I'm writing an autotest. One of the parts - you need to go to another section. The whole point is that selenium finds the button in app-header-left, but not the one in app-header-right. Returns that the element could not be found.

Site code


My attempts:
input_voc = driver.find_element_by_xpath('//*[@id="app-header-right"]/button').click() - for left button, works