There are a number of cases where popular manga published in Shonen Jump have moved to another magazine for various reasons.

Here are a few such names.
1. Black Clover
Black Clover was published in Weekly Shonen Jump starting February 2015. For many years, Black Clover has been one of the popular titles with a large fan base. However, on Weekly Shonen Jump published in Japan on August 21, 2023 it was announced that Black Clover will be moving to Jump Giga.

Regarding the reasons for this decision, author Yuki Tabata pointed out that the weekly manga production schedule is no longer suitable for his situation as a writer.
2. Boruto: Naruto Next Generations
The Boruto manga was originally serialized in Shueisha’s shonen manga magazine Weekly Shonen Jump from May 2016 to 2019. However, as of July 2019, this work has moved to V Jump.

3. JoJo’s Bizarre Adventure
From 1987 to 2004, JoJo’s Bizarre Adventure regularly appeared on Shonen Jump. The first 23 chapters of Steel Ball Run (the seventh part of JoJo) continue to be published in Weekly Shonen Jump. But then in March 2005, Steel Ball Run was ported to Ultra Jump. JoJolion and JoJoland are also fully featured in Ultra Jump.

4. Gintama
From 2003 to 2018, Gintama appeared weekly in Weekly Shonen Jump. Then in December 2018, Gintama switched to Jump Giga. The final part of the Gintama series is shown in the Gintama app.

Although the Gintama manga is a collection of short stories, there are a few stories that develop gradually over successive chapters.
5. World Trigger
World Trigger is a manga that has been on hiatus for a long time. This is a Shonen manga series written by Ashihara Daisuke, which began serialization in Weekly Shonen Jump in February 2013, and was adapted into an Anime the following year.

Since December 2018, World Trigger has continued to publish on WSJ before moving to Jump SQ (Jump Square). The second season of the anime adaptation aired in early 2021.
6. D.Gray-Man
D.Gray-Man was serialized in Weekly Shonen Jump from 2004 to April 2009. The manga was later serialized in Jump Square from 2009 to 2013.

In 2015, it was announced that D.Gray-Man would appear in Jump Square Crown, Shueisha’s new magazine. Unfortunately, Jump Square Crown ceased publication starting January 19, 2018. Later in 2018, D.Gray-Man appeared in Jump Square Rise.