Google: disable Back button in browser will not help to improve the position
Some SEOs believe that disabling the button allows to reduce the bounce rate and increase page position in the results. As it turned out, it is not.
According to Mueller, the inability to return to the previous page in the usual way degrades the UX, and can annoy users. Therefore it is better to refuse such admission. Thus on the position of the site in Google its use is not affected.
Listen to Muller's response, starting at 11:55 of the video below:
Previously, Google representatives have repeated that the bounce rate does not affect the position of sites in search engine results page of search engine Google or Bing.