My apps are all very small when opened. How do I reset app size to fill screen?
How can I adjust size of apps display to fill the screen on ipad?
iPad Pro 11-inch Wi-Fi
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Some Apps that are explicitly designed for iPhone. Some may only work in Portrait orientation - and some will not re-scale to the larger screen of iPad. In such cases, there is nothing that you can do to change the manner in which the App displays on your iPad.
Similarly, some Apps may or may not support both Portrait & Landscape modes - this being at the discretion of the App developer. Some Apps may only support one or other screen mode - and will always launch in this mode if the other is not supported.
Not all App developers choose to support Landscape mode in Apps intended for an iPhone.
You need to direct your feedback - and feature request for full iPad support - to the individual App Developer(s):
How to contact an app developer - Apple Support