What is ↑   Shift + ⌘ Cmd + L keyboard shortcut for?

Apple iBooks - Show or hide layout boundaries  

Microsoft Edge (macOS) - Paste and search or Paste and go (if it's a URL)  

TextMate - Select line  

Typora 0.9.81 (macOS) - Toggle Sidebar  

Adobe Animate CC (Mac) - Show / hide work area  

Adobe Illustrator (Mac) - Align paragraph left  

Adobe Lightroom Classic (Mac) - Toggle Lights Dim mode  

Adobe Photoshop (macOS) - (Horizontal Type tool) Align left  

Adobe Photoshop (macOS) - (Vertical Type tool) Align left  

Adobe Photoshop Elements (Mac) - (when Horizontal Type tool or Horizontal Type Mask tool selected) Align left  

Adobe Photoshop Elements (Mac) - (when Vertical Type tool or Vertical Type Mask tool selected) Align top  

Adobe Premiere Pro (Mac) - Left  

Canva (Mac) - Left align text  

Corel Painter (Mac) - Lighting mover  

Corel Painter (Mac) - Dry digital watercolor  

DaVinci Resolve 15 (Mac) - Linked selection  

Harmony 20 (macOS) - Lock all  

Harmony 20 (macOS) - Lock all  

Sketch - Lock/unlock layer  

VMware Fusion - Virtual machine library  

AWS Cloud9 IDE (Mac) - Reveal File In File Tree  

GitHub - Move card to the bottom of the rightmost column  

Looker 6.8 (Mac) - Download  

Looker 6.8 (Mac) - Download current query  

Proto.io (macOS) - Toggle lock  

RStudio (Mac) - Load All (devtools)  

Visual Studio Code (Mac) - Select all occurrences of current selection  

Elementor - Open Template Library modal  

Quora - Math  

Webflow - Toggle collaborators on selected element (Mac)  

Adobe Bridge CC (Mac) - Slideshow options  

Apple Finder - Open Downloads folder  

QLab 4 - Toggle Between Cue Lists & Active Cues  

QuickTime Player (macOS) - Rotate left  

Cisco Webex - Rotate the page left  

Tumblr - Insert horizontal line  

Ableton Live 10 (Mac) - Select Material in Loop  

Adobe Captivate 2019 (macOS) - Insert a highlight box  

Airmail - Find All Folders  

Apple Pages - Show or hide layout boundaries  

BitWarden - (macOS) Auto-fill with last used login  

Dorico (macOS) - Layout options  

Google Sheets (Mac) - Left align  

iPad Smart Keyboard - Flag email  

iPadOS 13 - Show sidebar  

Miro (macOS) - Copy board link  

Nuendo 10 (macOS) - Lock  

OmniFocus 3.3 (iOS) - Set / Remove flag  

OnSite - Link document  

Quip - Bulleted list style  

Superhuman (macOS) - Send later  

Things (iPad) - Show to-do in list  

Things (Mac) - Show to-do in list  

GeoGebra - View/Hide Construction Protocol