Simply limit the post title based on width and lines.
For Elementor Extra post widget, go here.
/*Add Selector to limit the CSS */
selector .elementor-post__title
{ display: block; /* Fallback for non-webkit */
display: -webkit-box;
height:em; /* Fallback for non-webkit, line-height * 2 */
line-height: 1.3em;
-webkit-line-clamp: 1; /* if you change this, make sure to change the fallback line-height and height */
-webkit-box-orient: vertical;
overflow: hidden;
text-overflow: ellipsis;
}
/*Add Selector to limit the CSS */
.elementor-post__title
{ display: block; /* Fallback for non-webkit */
display: -webkit-box;
height:em; /* Fallback for non-webkit, line-height * 2 */
line-height: 1.3em;
-webkit-line-clamp: 2; /* if you change this, make sure to change the fallback line-height and height */
-webkit-box-orient: vertical;
overflow: hidden;
text-overflow: ellipsis;
}

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the

This Is an Example of a Post With Relatively Long Title
This is a post that was posted on WordPress. It could be said that the