So ändern Sie die Größe der Symbole im Anwendungsmenü Ubuntu
#You can edit /usr/share/gnome-shell/theme/gnome-shell.css.
#Don't forget to make a backup of the original file!
#Search for a line starting with #dash {.
#In the following lines you can change the properties like .icon-grid { spacing and icon-grid .overview { icon-size.
#After your changes you have to restart the Gnome Shell with Alt+F2 and typing r and Enter.
The Explolearner