Text editor function to indent multiple lines at once
You can go to Preferences > Keyboard and then select “Allow Tab key to indent text blocks”.
indentation
Adobe brackets: write spaces instead of tabs
In the lower-right of the status bar you should see an indicator saying “Tab Size.” Click the label to toggle to spaces. To change the amount of indent, click the number next to it and type a new value. Note: if the indicator already says “Spaces” then Brackets should be using spaces instead of tab … Read more
How to remove tab indent from several lines in IDLE?
If you’re using IDLE, you can use Ctrl+] to indent and Ctrl+[ to unindent.
How to change indentation mode in Atom?
See Soft Tabs and Tab Length under Settings > Editor Settings. To toggle indentation modes quickly you can use Ctrl-Shift-P and search for Editor: Toggle Soft Tabs.