Most of the time it's swagged across to a hook. I have seen a few example where they change out the light itself for something that's less noticeably off center.

There isn't a way. Move the light, repair the ceiling, or move the table underneath the light. Or do it unattractively.

Hi nonna36, here you go...

https://www.dwell.com/shop/workstead-shaded-pendant-light.html

http://www.ylighting.com/artemide-tolomeo-off-center-suspension-light.html?PID=1455108858&source=pla_gg_1455108858_artemide-tolomeo-off-center-suspension-light_692373779_38424861289&utm_medium=pla&utm_source=cpc&utm_source=google&utm_medium=paid_search&utm_campaign=paid_search_google_pla&scid=scplp1455108858&sc_intid=1455108858&gclid=CjwKEAiA8dDEBRDf19yI97eO0UsSJAAY_yCSZysHHsswztHTEBKQgO3-o5VqtErN8-MGFHA51NQG1hoCCA3w_wcB

Depending on how far it is from where you want the chandelier to hang:

Remove chandelier; feed the wires through the opening in a ceiling medalion (your choice of styles), now reattach the wires. Secure the chandelier where you want it; push the medallion up to ceiling. Now the outlet and the wires should be hidden under the apron of the medalion. Hard to explain but easy enough to do. You have swagged the light, but all is hidden under the medalion.

"Depending how far off the new fixture location is from center, you could cover the old junction box with a large-enough plaster medallion or rosette. As long as the medallion is screwed in and not glued to the ceiling, it acts as overscaled junction box cover. These medallions come in all sizes and styles."

Can u show an image?

can you send a link to the first picture with the 3 pendant lights?

the first pic you posted with the four hanging glass pendant

lights and dark rectangle mount where the outlet box is off centered, where can I buy that fixture? and do they sell just that rectangle mount?

https://www.roomandboard.com/catalog/lighting/pendant-lights-and-chandeliers/canopy-ceiling-plates

HU-620117635 I saw an "accessory canopy" on Home Depot's site for THREE pendant lights. I think this would work if you could find one with four. I have the same problem with an off centered junction box and I love the first picture as well.

I love how the pro comment was proved wrong. You are not a pro by thinking linear. You are a pro by thinking adaptivity and outside the box. That said, an enclosure above the light to run it horizontal while giving the appearance of a base can be added to any ceiling. Think of an elevated platform, but on your ceiling hope this helps.