アートボードツールのオプションバーのサイズのメニューについて

おそらくここと同じプリセット名が表示されるだけですから、それが仕様だと思います。

不便なようならプリセットを作って保存しておけば、メニューに表示されます。

参考に：ローカライズ前のプリセット（一部）がこれですから多分仕様です。｛ローカライズ後が Web（中）とWeb（小）になっていないのはミスかもしれませんが...｝

                {

                    "name": "$$$/public/DefaultNewDocSizes/Web/WebLarge1920x1080/Name=Web Large",

                    "width": "$$$/private/DefaultNewDocSizes/Web/WebLarge1920x1080/Width=1920",

                    "height": "$$$/private/DefaultNewDocSizes/Web/WebLarge1920x1080/Height=1080",

                    "units": "$$$/private/DefaultNewDocSizes/Web/WebLarge1920x1080/Units=pixelsUnit",

                    "profile": "none",

                    "resolution": 72,

                    "resolutionUnits": "inchesUnit",

                    "depth": 8,

                    "scale": 1,

                    "mode": "RGB",

                    "fill": "white",

                    "showInFNFT": true,

                    "legacyAddSizeToName" : true,

                    "artboards": [

                        {

                            "top": 0,

                            "left": 0,

                            "bottom": 1080,

                            "right": 1920

                        }

                    ]

                },

                {

                    "name": "$$$/public/DefaultNewDocSizes/Web/Web1440x900/Name=Web Medium",

                    "width": "$$$/private/DefaultNewDocSizes/Web/Web1440x900/Width=1440",

                    "height": "$$$/private/DefaultNewDocSizes/Web/Web1440x900/Height=900",

                    "units": "$$$/private/DefaultNewDocSizes/Web/Web1440x900/Units=pixelsUnit",

                    "profile": "none",

                    "resolution": 72,

                    "resolutionUnits": "inchesUnit",

                    "depth": 8,

                    "scale": 1,

                    "mode": "RGB",

                    "fill": "white",

                    "showInFNFT": true,

                    "legacyAddSizeToName" : true,

                    "artboards": [

                        {

                            "top": 0,

                            "left": 0,

                            "bottom": 900,

                            "right": 1440

                        }

                    ]

                },

                {

                    "name": "$$$/public/DefaultNewDocSizes/Web/WebMinimum1024x768/Name=Web Minimum",

                    "width": "$$$/private/DefaultNewDocSizes/Web/WebMinimum1024x768/Width=1024",

                    "height": "$$$/private/DefaultNewDocSizes/Web/WebMinimum1024x768/Height=768",

                    "units": "$$$/private/DefaultNewDocSizes/Web/WebMinimum1024x768/Units=pixelsUnit",

                    "profile": "none",

                    "resolution": 72,

                    "resolutionUnits": "inchesUnit",

                    "depth": 8,

                    "scale": 1,

                    "mode": "RGB",

                    "fill": "white",

                    "showInFNFT": true,

                    "legacyAddSizeToName" : true,

                    "artboards": [

                        {

                            "top": 0,

                            "left": 0,

                            "bottom": 768,

                            "right": 1024

                        }

                    ]

                },

                {

                    "name": "$$$/public/DefaultNewDocSizes/Web/Web1280x800/Name=Web Small",

                    "width": "$$$/private/DefaultNewDocSizes/Web/Web1280x800/Width=1280",

                    "height": "$$$/private/DefaultNewDocSizes/Web/Web1280x800/Height=800",

                    "units": "$$$/private/DefaultNewDocSizes/Web/Web1280x800/Units=pixelsUnit",

                    "profile": "none",

                    "resolution": 72,

                    "resolutionUnits": "inchesUnit",

                    "depth": 8,

                    "scale": 1,

                    "mode": "RGB",

                    "fill": "white",

                    "showInFNFT": true,

                    "legacyAddSizeToName" : true,

                    "artboards": [

                        {

                            "top": 0,

                            "left": 0,

                            "bottom": 800,

                            "right": 1280

                        }

                    ]

                },