How can I stay tab-free in Geany on Ubuntu?

How can I stay tab free in Geany on Ubuntu?

When I am coding in Python, tabs have always annoyed me. And the TAB is invisible. So strange.

When I open my code by gedit, those TABs are visible.

What is geany Ubuntu?

Geany is a fast and lightweight IDE (Integrated Development Environment). It can run easily on both gnome and kde as it needs only GTK2 Runtime librarys. As well as running on various WM's within Ubuntu it is also known to run under many different distributions and operating systems.

You are looking for 'soft tabs'

http://www.geany.org/manual/dev/index.html#editor-indentation-preferences

Edit > Preferences > Editor > Indentation > Type > Spaces

After changing the setting, close and reopen the file.

To apply the tab settings to every document in the current session, also click:
Project->Apply Default.