On your Mac, use General System Preferences to change the overall appearance of macOS, specify how you use scroll bars, windows and tabs and enable some Continuity features, if available.
To change these preferences, choose Apple menu / System Preferences, then click General .
#appearance
#Accentcolour
#Highlightcolour
#Sidebariconsize
#Allowwallpaper tinting in windows
Show scroll bars
Click in the scroll bar to
Default web browser
Prefer tabs when opening documents
Ask to keep changes when closing documents
Close windows when quitting an app
#Recentitems
Allow Handoff between this Mac and your iCloud devices