So your Tool Options are missing.
This video will show you how to get them back.
I'm using GIMP 2.8.18 and I do believe this will also work in the latest version of GIMP.
If this doesn't work, please let me know in the comments.
Visit Gimp Chat.
Where Imagination Meets Innovation
http://gimpchat.com
Watch video Tool Options Missing online without registration, duration hours minute second in high quality. This video was added by user Geo Sam 28 September 2018, don't forget to share it with your friends and acquaintances, it has been viewed on our site 713 once and liked it 15 people.