Avoid tautology. Express your ideas without using the label ‘Express’ or ‘Expression’.
This is a classic editing issue, because it is easier to spot the problem with a second pair of eyes. You can easily express your idea without titling it ‘express’ or ‘expression’.
“Research Topics of Interest" works fine. Saying of interest is itself your expression of how appealing those topics are to you.
Sometimes the template itself introduces the problem by inviting you to insert Expression of a research interest. But you wouldn’t include the word slide within the very title of a presentation slide, like “Slide of Proposed Topics.“
There are exceptions to the rule of not labeling material with ‘label,’ such as Statement Of Work (SOW). In that case, the fixed title has the legal weight of “These are the terms we agreed on, as documented and signed in the Statement Of Work.”
As an aside, if you number your research titles in the body of the slide, it makes it easy for your audience to give you feedback like “Topic 3 is too generic.“ Or “Topic 2 and 5 will be the easiest for you to get grants.“