For barrett's esophagus, fundoplication is not routinely indicated as it has not been proven more beneficial than PPI. Moreover, they shouldnt undergo surgery before endoscopic eradication.
Barrett's esophagus when in complication can confuse the next line of management when patient presents with GERD and barrett's esophagus.
The uptodate link for management of barrets esophagus is also here.
https://www.uptodate.com/contents/barretts-esophagus-surveillance-and-management?sectionName=MANAGEMENT%20OF%20DYSPLASIA%20OR%20INTRAMUCOSAL%20CARCINOMA&search=barret%20esophagus&topicRef=2278&anchor=H168917831&source=see_link#H62054350
Source: AMBOSS - https://next.amboss.com/us/courses/TE06E3/JxRsx6Y/questions/u_bL0pJwwg/25?sv=%5B%7B%22type%22%3A%22article%22%2C%22id%22%3A%22vg0AC2%22%2C%22anchor%22%3A%22p80Ln3%22%7D%5D&svi=0&q=GERD+management&v=overview