Pokémon GO is immensely popular, but some who live in sparse areas may be a bit turned off by the fact that it can be hard to see very distant landmarks, or to plan a long route across rural trails with few PokéStops and gyms. Those who want to see more of the map, or simply play the game in landscape mode for any other reason, can take advantage of a glitch in the game to force it into landscape orientation, at least, if they're playing on an iOS device. The glitch was attempted on a Nexus 5X, using all the same steps, and nothing happened.
The glitch is initiated through the in-game reporting function, which allows users to bring any show-stopping issues to Niantic's attention when they're encountered in the middle of playing. The report system is not fully in-game, however, and whisks you away to a web form. That's what makes the glitch possible. The "Report High-Priority Issue" button is nestled in the settings, which can be accessed via the gear in the upper right that you'll see after clicking the Pokéball in the bottom of the screen during gameplay. If you turn your iPhone sideways and click that button, then click "Yes" to confirm leaving the app, don't go to the support website and actually do anything - simply hit the home button, then relaunch Pokémon GO. You'll be looking at the game in landscape mode. It was described as more than a little "wonky", with catching Pokémon in particular said to be somewhat broken.
As mentioned above, an attempt to reproduce the glitch was made on a Nexus 5X, but to no avail. Android users have an alternative, however - an app, in the Play Store, called Set Orientation, made by The Eyes-Free Project. This app doesn't require root, and allows you to force your phone into whatever orientation you want it to be in. In testing on a Nexus 6, the map displayed beautifully. Menu items were a bit on the... well, gigantic side, and encountering a wild Pokémon resulted in the Pokémon being directly on the ground and very, very close. Even turning off the AR, a thrown Pokéball would simply bounce away - the Pokémon was just too close. Turning the AR back on resulted in the Pokémon going on the move, somehow always avoiding the phone's camera sensor. Luckily, the app displays a notification in your status bar that allows you to disable it or force a different orientation on demand, though in the test with the Nexus 6, it was necessary to completely clear the app from Recents, then restart it in either force portrait or with the app disable, making this solution far from ideal. If you would like to try it for yourself, hit up the app link below.