If you want even more control you can use AppleScript.
Open a window, resize and position it to your liking, and then run this script from Apple's Script Editor.app.
The bounds of the front window will be placed on the clipboard, and they look like this:
--------------------------------------------------------
# Auth: Christopher Stone
# dCre: 2021/01/11 18:03
# dMod: 2021/01/11 18:03
# Appl: BBEdit
# Task: Place Bounds of Front Window on the Clipboard
# Libs: None
# Osax: None
# Tags: @Applescript, @Script, @BBEdit, @Window, @Bounds, @Clipboard
--------------------------------------------------------
tell application "BBEdit"
tell front window
set frontWindowBounds to bounds
end tell
end tell
try
frontWindowBounds / 0
on error errMsg
set {oldTIDS, AppleScript's text item delimiters} to {AppleScript's text item delimiters, {"Can’t make ", " into type real."}}
set frontWindowBounds to text item 2 of errMsg
set AppleScript's text item delimiters to oldTIDS
set the clipboard to frontWindowBounds
end try
--------------------------------------------------------
Use this script to actually set the size and position of the front window.
Replace the bounds in the script by pasting in the ones you just created.
--------------------------------------------------------
# Auth: Christopher Stone
# dCre: 2021/01/11 18:07
# dMod: 2021/01/11 18:07
# Appl: BBEdit
# Task: Set Bounds (Size & Position) of Front Window
# Libs: None
# Osax: None
# Tags: @Applescript, @Script, @BBEdit, @Set, @Bounds, @Size, @Position, @Front, @Window
--------------------------------------------------------
tell application "BBEdit"
tell front window
set its bounds to {380, 45, 1440, 1196}
end tell
end tell
--------------------------------------------------------
Save the script using the Apple Script Editor.app to BBEdit's Script Folder.
~/Library/Application Support/BBEdit/Scripts/
Give the script a keyboard shortcut in BBEdit's “Menus & Shortcuts” preferences, and go to town.
You can save yourself a step when creating new windows if desired using this script:
--------------------------------------------------------
# Auth: Christopher Stone
# dCre: 2021/01/11 18:07
# dMod: 2021/01/11 18:12
# Appl: BBEdit
# Task: Make a New Window and Set Its Bounds (Size & Position).
# Libs: None
# Osax: None
# Tags: @Applescript, @Script, @BBEdit, @Set, @Bounds, @Size, @Position, @Front, @Window
--------------------------------------------------------
tell application "BBEdit"
make new text window
tell front window
set its bounds to {380, 45, 1440, 1196}
end tell
end tell
--------------------------------------------------------
You can also get creating and calculate the size and position of the window given your monitor size, although this takes a little effort.