It's not a modal
A modal, as an object, is not a thing. I blame lazy naming of things in UI design tools, and how credulous our practice has become, never fighting back to keep proper processes, procedures, methods, goals, and even just terms.
It is a dialog. Or dialogue.
If you like, use the term “pop up.” I often first describe, such as in the title of the design system or style guide by calling them “Pop up dialogs” so everyone is on board.
Then, we describe modality. Yeah, that’s a thing.
Modal — A window appears because of a transient but specific mode (enter info, confirm this…) and once the condition is met by selecting actions inside the window, it will disappear. Some modal windows can be dismissed without action, or have an abort function so will cancel/revert the mode that caused the window to appear.
Modeless — A window is persistent, or can be made to appear or disappear via some deliberate control. Usually they can be moved around the viewport, but regardless they can be used at the same time as other modeless windows or the background (desktop or page). Actions within the modeless window may dismiss, close, or minimize the window but this is not required, and controls may take actions without closing the window.
Semi-modal — Same as modal, but clicking outside the window will also close it. This is valuable for non-required or dangerous steps where easier dismissal is desired.
Then, you can have a modal dialog, sure.
Words have meaning though. Calling all dialogs “modals” will result in several things, which I have seen:
All dialogs are modal. What if a semi-modal would work better?
No understanding of modeless dialogs. So, persistently floating things like chat windows are designed oddly or imprecisely as there’s no shared language or understanding what they are or should act like.
No understanding that modality exists. This doesn’t just get limited to dialogs, but leaves a blind spot for the context, and assumption that all other windows are OS level and we don’t do that. If you get modality, you can float multiple windows when you build apps, you can start to understand the appeal of widgets etc. Sticking to “modal” is web-browser-only mindset, and limits everyone.
Imprecision. No one defines modality so devs may implement not what is expected. I have seen designers assume it was semi-modal, but dev saw “modal” and that is what they built.
And maybe more. Imprecise and lazy documentation, even to simple labels like this, is actively dangerous. Don’t fall into simple traps like this.