foobnix
Add Small Window feature
The Small Window (aka picture-in-picture mode) feature allows you to display a window overlaying other apps and pin it to the edge of the screen as an always-on small label. The label can be freely moved along the side edges of the screen.
This mode in the case of a reading application is convenient because it allows you to place a sticker on the screen with data that you need constant access to while working with another application. At the same time, unlike Split-screen, this mode does not significantly reduce the size of the main application, but prevents it from being unloaded from memory without having to disable memory optimization for this application.
More details: Android Developers / Develop / Core areas / UI / Guides / Support multi-window mode
You can force this through developer options by enabling (1) Force activities to be resizable and (2) Enable non-resizable in multi windows. If you're in tablet you can also enable (*) Enable freeform windows
You may need to restart the device after toggling the settings
You can force this through developer options by enabling (1) Force activities to be resizable
I don't have this setting.
and (2) Enable non-resizable in multi windows.
This setting in my case is called
Enable non-resizable in multi-window (allow non-resizable apps to be displayed in multi-window mode)
and it is enabled. Two dozen applications from the installed ones can be displayed in PiP mode. Librera Reader is not.
OS version: Funtouch OS 14 Model: Vivo T1 (4G, V2153) Hardware version: MP_0.1 Build number: PD22010F_EX_A_14.2.9.0.W20 Baseband version: .HA.1.1.c2-00054-DIVAR_GENSP_PACK-1.29062.107 Kernel version: 4.19.157-perf+, 1 Sat Oct 12 11:14:50 CST 2024 Compile time: 12 Oct 2024 06:06:30 Android security update: 1 October 2024 Google Play system update: 1 October 2024 Software parameter update: 29 October 2024