It looks like you're asking for a feature or explainer on something called — but this doesn’t correspond to any known standard app, version number, or setting in the official Smart YouTube TV ecosystem (like SmartTubeNext for Android TV).
: It supports Android 4.0+ (Ice Cream Sandwich), meaning it can revive functionality on older smart TVs where the official app may have stopped working. Key Specifications for Version 6.17.391 Release Date June 26, 2020 File Size Minimum OS Android 4.0 (API 14) Package Name com.liskovsoft.videomanager Developer yuliskov (LiskovSoft) Comparison with the Official App smart youtube tv 617 391 better
: Uninstall all existing YouTube applications from your TV to avoid conflicts. Download version 6.17.391 Open your TV’s web browser. "Smart YouTube TV 617 391 better" It looks
library from the Play Store or browser is highly recommended. Selection: Choose the "Light Alt" Download version 6