Hey,
Thanks for letting us know about the situation. We'd love to help you with this.
Joomla allows you to select the Template style for a single article or a Page. You can design as many templates as required in TT, export templates without content, and can install them in Joomla Follow the steps to set the Template style
Open Joomla Backend->Install the theme->Menu->Your Menu->click on the menu item whose you want to set the style->Template style-> Select the theme which you exported without content->Save
We are also sharing screenshots for your reference. We hope this is helpful. Let us know if you have any more questions, comments, or concerns.
