Thanks for the reply, @rdbende . I should have included more information to begin with.

Tested Python versions: 3.6.9, 3.10.3
Host system: Ubuntu 20.04

The askdirectory dialog has a white background. The font is white or invisible, rendering the text unreadable. Once selected or clicked on, the text changes to black (and staying black!), making it readable. See screenshot attached.

import tkinter as tk
from tkinter import ttk, filedialog


class App(ttk.Frame):
    def __init__(self, parent):
        ttk.Frame.__init__(self)
        self.widgets_frame = ttk.Frame(self)
        self.widgets_frame.grid()
        self.button = ttk.Button(self.widgets_frame, text="Open Folder",
                                 command=filedialog.askdirectory)
        self.button.grid(row=0, column=0, padx=5, pady=10, sticky="nsew")


if __name__ == "__main__":
    root = tk.Tk()

    root.tk.call("source", "azure.tcl")
    root.tk.call("set_theme", "dark")

    app = App(root)
    app.pack(fill="both", expand=True)

    root.mainloop()

filedialog window has white text on white background (for dark mode) #35

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