This appears to still be a problem with 2018 beta.
E.g., I can not double click the 'Location' column and have it expand to the correct width, nor am I able to grab the column separator to resize the column, correctly.
SlickEdit Pro 2018 (v23.0.0.2 64-bit)
Serial number: FE35645_BETA
License type: Beta License
License expiration: 2018-10-09 17:00:00
License file: C:\ProgramData\slickedit\23\slickedit.lic
Build Date: July 23, 2018
Emulation: Vim
OS: Windows 10 x64
OS Version: 10.00.0
Memory: 41% Load, 6780MB/16265MB Physical, 9399MB/18697MB Page File, 4327MB/134217727MB Virtual
Shell Information: C:\WINDOWS\system32\cmd.exe /q
Screen Size: 1920 x 1040, 1200 x 1920
Project Type: Gnuc
Language: .c (C/C++)
Encoding: Automatic
Installation Directory: C:\Program Files\SlickEdit Pro 23.0.0 Beta1\ (non-removable drive,NTFS,48060MB free)
Configuration Directory: C:\Users\bkurle\Work Folders\Documents\My SlickEdit Config\23.0.0\ (non-removable drive,NTFS,48060MB free)
Migrated from: C:\Users\bkurle\Work Folders\Documents\My SlickEdit Config\22.0.2\