Can only marquee zoom when in overprint preview or wireframe.
The marquee zoom tool is not working correctly in CC 2019. Previously you could turn "Zoom to selection" on or off. In CC 2019 this option is still available under preferences, but regardless if you turn it on or off, the marqee zoom feature only works if you're in overprint preview or wireframe. When in GPU Preview, only "Zoom to selection" works, even if you have it turned off.
MacOS Sierra 10.12.6
Mac Pro (Mid 2010)
Processor: 2.8 GHz Quad-Core Intel Xeon
Memory: 16 GB 1066 MHz DDR3
Graphics: ATI Radeon HD 5770 1024 MB