In my Admin panel I created a testing topic page and got URL(e.g. ... /testing-topic) and after that I deleted that topic page. Afterwards I decided create topic page with the same name and got URL (e.g. .../testing-topic-1). In testing purposes I was creating and deleting many topic pages with the same name and every single time I was getting increment. now mu URL is .../testing-topic-12. Is there any chance to change that to .../topic-page from admin panel?
Is there any chance to change that to .../topic-page from admin panel?
You need to change also Search engine friendly page names. After deleting, you did not clear that table, so "old" name was already there, and new page got increment value.
You can delete those URLs from Administration -> System -> Search engine friendly page names, search for your URL (in your case testing-topic), mark it and click the Delete Selected button.
After that, you will be able to create a topic with that Search engine friendly name.