That's the Properties panel. Try Window > Character or Window > Paragraph.
You are looking at the Properties panel and not the the Character panel. You can go to Window>Character to bring up the Character panel or click on the Advanced button in the Properties panel. (Avancé)
When I do Windows / Characters I reach the Property Tab I pasted the screenshot above.
When I do Advanced on that tab nothing happens.
I have a "Character style" tab but it looks like this:
I also have a PAragraph style that looks like this:
Hidden in there I have a paragraph spacing but I cannot see the screenshot Dave displayed above.
When I do Windows / Paragraph I reach my "paragraph style".
I have been using line spacing for almost 20 years in Photoshop and suddenly I'm really confused. Old age?
I found the orginal panels: they were simply displayed BELOW a long list of panels, completely off screen!
Duh.... Really old age.
Thanks for all!
Don't worry, we've all been there ☺