Finder- getting rid of divider bar in every new window

finder mojave

Looks like you have enabled "Preview". Type Shift-Cmd-P to toggle it (or toggle it in the View menu).

Related

remove track number from start of song name iTunes
Shouldn't Apple consider allowing use of Apple Pencil while it's charging?
How to download old versions of apps to old iPad
Macbook pro mid 2014 15" turns screen off when unplugged and starts fans at max power
Meaning of AMD-Action:authenticate:SP
How do currently downloading files show a circular progress indicator besides them in Finder?
App Store Optimization: Individual localization for English (U.S.), Australia, Canada and U.K.?
Any proper list of Mac firmware versions (Boot ROM versions) and the corresponding macOS version?
When does software take over firmware during boot in Macs?
How does Siri come up with contact suggestions?
How to resolve Microsoft Excel for Max OS X Yosemite error "Cannot use object linking and embedding"?
View email source in iOS Gmail app