In some plugins, the dropdown for path suggestion is hidden. I suspect it’s because they are old plugins, as Templater, a newly updated one, or core plugins doesn’t have this problem.
In this screenshot, I just press enter to accept the value.

SYSTEM INFO:
Obsidian version: 1.13.6
Installer version: 1.13.6
Operating system: Windows 11 Home Single Language 10.0.26200
Login status: not logged in
Language: en
Insider build toggle: off
Live preview: off
Base theme: adapt to system
Community theme: Catppuccin 0.4.18
Snippets enabled: 2
Restricted mode: off
Plugins installed: 37
Plugins enabled: 35
1: Another Quick Switcher v14.7.0
2: Various Complements v11.4.0
3: Advanced Tables v0.23.2
4: Auto Link Title v1.5.5
5: Better Inline Fields v0.3.5
6: Code Editor Shortcuts v1.14.0
7: Better Word Count v0.10.1
8: Dataview v0.5.68
9: Dataview Autocompletion v0.9.5
10: File Diff v1.1.2
11: Enveloppe v7.8.2
12: Folder notes v1.8.26
13: Front Matter Title v4.1.1
14: Global Search and Replace v0.5.0
15: Excalidraw v2.26.4
16: Heading Shifter v1.12.1
17: Hledger Notes v1.1.2
18: Image Captions v1.1.7
19: Image Context Menus v1.13.0
20: Image to text OCR v1.0.5
21: Jump to link v0.5.16
22: Language Translator v1.0.4
23: Note Refactor v1.8.2
24: Natural Language Dates v0.6.4
25: Open with v0.3.2
26: Path Finder v1.1.7
27: Plugin Groups v2.1.0
28: Quick Switcher++ v6.1.6
29: Quick Explorer v0.2.19
30: Regex Find/Replace v1.2.0
31: Style Settings v1.0.9
32: Templater v2.25.0
33: Version History Diff v2.3.8
34: Update time on edit v2.4.0
35: Advanced Mobile Toolbar v1.8.0
RECOMMENDATIONS:
Custom theme and snippets: for cosmetic issues, please first try updating your theme and disabling your snippets. If still not fixed, please try to make the issue happen in the Sandbox Vault or disable community theme and snippets.
Community plugins: for bugs, please first try updating all your plugins to latest. If still not fixed, please try to make the issue happen in the Sandbox Vault or disable community plugins.