Hi Lisha - I'm not totally sure what you are trying to achieve. Are you saying you have lunar return for, say, 3 March 2023, and you want to check the converse chart that corresponds to this date. Or do you want to look at the lunar return chart closest to the converse date that corresponds 3 March 2023.
For example in my chart 3/3/2023 corresponds to 20/4/1906 converse using Horoscope-Progression-Diurnal Horoscope. If I go to Horoscope-List and look for lunar returns to my natal lunar degree during 1906 I get screen shot below. In this case it looks like the lunar return of 25/4/1906 is the closest in date, and the one preceding the converse date is 29/3/1906.
On the other hand, if you want the equivalent converse date for the lunar return preceding 3/3/2023, use Horoscope-List to calculate the dates of lunar returns in 2023. Identify the relevant return date, and then use the Diurnal Horoscope to find the equivalent converse date for the chosen lunar return.
Ed