Update

config/sway/config.d/98-application-defaults.conf

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+# don't show gaps if there's only one window on the desktop
+smart_gaps on
+
+# set floating mode for generated windows
+for_window [title="(?:Open|Save) (?:File|Folder|As)"] floating enable
+for_window [title="(?:Open|Save) (?:File|Folder|As)"] resize set 800 600
+for_window [window_role="pop-up"] floating enable
+for_window [window_role="bubble"] floating enable
+for_window [window_role="task_dialog"] floating enable
+for_window [window_role="Preferences"] floating enable
+for_window [window_type="dialog"] floating enable
+for_window [window_type="menu"] floating enable
+
+# set floating mode for specific applications
+for_window [instance="lxappearance"] floating enable
+for_window [app_id="pamac-manager"] floating enable
+for_window [app_id="blueberry.py"] floating enable
+for_window [app_id="dragon-drop"] floating enable, sticky enable
+for_window [app_id="firefox" title="^Library$"] floating enable, border pixel 1, sticky enable
+for_window [app_id="thunderbird" title=".*Reminder"] floating enable
+for_window [app_id="floating_shell"] floating enable, border pixel 1, sticky enable
+for_window [app_id="Manjaro.manjaro-settings-manager"] floating enable
+for_window [app_id="" title="Picture in picture"] floating enable, sticky enable
+for_window [app_id="" title="Picture-in-Picture"] floating enable, sticky enable
+for_window [instance="around"] floating enable, sticky enable
+for_window [app_id="xsensors"] floating enable
+for_window [title="Save File"] floating enable
+for_window [title="Firefox .*— Sharing Indicator"] floating enable, sticky enable, move to scratchpad
+for_window [app_id="" title=".* is sharing your screen."] floating enable
+for_window [title="^wlay$"] floating enable
+
+# Don't allow applications to inhibit shortcuts, i.e. grab total control of the
+# keyboard. Chrome currently abuses this by enabling it for all "--app=..."
+# shortcuts.
+seat * shortcuts_inhibitor disable