diff --git a/frontend/src/components/input/filter/highlighter.ts b/frontend/src/components/input/filter/highlighter.ts
index e0372c052..5aa346fcd 100644
--- a/frontend/src/components/input/filter/highlighter.ts
+++ b/frontend/src/components/input/filter/highlighter.ts
@@ -8,6 +8,7 @@ import {
 	FILTER_OPERATORS_REGEX,
 	getFilterFieldRegexPattern,
 	LABEL_FIELDS,
+	PROJECT_FIELDS,
 } from '@/helpers/filters'
 import {useLabelStore} from '@/stores/labels'
 import {colorIsDark} from '@/helpers/color/colorIsDark.ts'
@@ -148,12 +149,70 @@ function decorateDocument(doc: Node) {
 		}
 	})
 
-	// Match other values - anything coming after an operator (excluding labels and dates)
+	// Handle project fields with multi-value support
+	PROJECT_FIELDS.forEach(projectField => {
+		const pattern = getFilterFieldRegexPattern(projectField)
+		let projectMatch
+		while ((projectMatch = pattern.exec(text)) !== null) {
+			const projectValue = projectMatch[4]?.trim()
+			const operator = projectMatch[2]?.trim()
+
+			if(!projectValue) {
+				continue
+			}
+
+			const valueStart = projectMatch.index + projectMatch[0].lastIndexOf(projectValue)
+			const valueEnd = valueStart + projectValue.length
+
+			const addProjectDecoration = (projectValue: string, start: number, end: number) => {
+				const from = findPosForIndex(doc, start)
+				const to = findPosForIndex(doc, end)
+
+				if (from === null || to === null) {
+					return
+				}
+
+				valueRanges.push({start, end})
+
+				// Use generic value styling for projects
+				decorations.push(
+					Decoration.inline(from, to, {class: 'value'}),
+				)
+			}
+
+			// Check if this is a multi-value operator and the value contains commas
+			const isMultiValueOperator = ['in', '?=', 'not in', '?!='].includes(operator)
+			if (isMultiValueOperator && projectValue.includes(',')) {
+				// Split by commas and create decorations for each individual project
+				const projects = projectValue.split(',').map(p => p.trim()).filter(p => p.length > 0)
+				let currentOffset = 0
+
+				projects.forEach(individualProject => {
+					// Find the position of this individual project within the full value
+					const projectIndex = projectValue.indexOf(individualProject, currentOffset)
+					if (projectIndex !== -1) {
+						const individualStart = valueStart + projectIndex
+						const individualEnd = individualStart + individualProject.length
+
+						addProjectDecoration(individualProject, individualStart, individualEnd)
+
+						currentOffset = projectIndex + individualProject.length
+					}
+				})
+
+				continue
+			}
+
+			addProjectDecoration(projectValue, valueStart, valueEnd)
+		}
+	})
+
+	// Match other values - anything coming after an operator (excluding labels, dates, and projects)
 	fieldValueRegex.lastIndex = 0
 	while ((match = fieldValueRegex.exec(text)) !== null) {
 		const [fullMatch, field, operator, value] = match
 
-		if (LABEL_FIELDS.includes(field) || DATE_FIELDS.includes(field)) {
+		if (LABEL_FIELDS.includes(field) || DATE_FIELDS.includes(field) || PROJECT_FIELDS.includes(field)) {
 			continue
 		}